Below is the full code. I did not add those chapter titles. Does the Plex Movie agent or The Movie Database download those chapter titles? I do notice that some movies have these titles and some do not. I think the movies without the titles are correct.
That double quote does look suspicious because it may think it is closed out before it really is. But even without the double quotes if I compare my Start Time of the first chapter to yours, they are different. It appears the Start and End times of my chapters are different than yours. For example my Chapter 2 start time is incorrectly ā0ā and your Chapter 1 start time is ā0ā which is correct.
Also, I only use MakeMKV when generating these files.
This XML file does not appear to have any style information associated with it. The document tree is shown below.
<MediaContainer size="1" allowSync="1" identifier="com.plexapp.plugins.library" librarySectionID="1" librarySectionTitle="Movies" librarySectionUUID="a0a4881d-a66e-4870-8153-233442f8e809" mediaTagPrefix="/system/bundle/media/flags/" mediaTagVersion="1534768060">
<Video ratingKey="1143317" key="/library/metadata/1143317" guid="com.plexapp.agents.imdb://tt3521164?lang=en" librarySectionTitle="Movies" librarySectionID="1" librarySectionKey="/library/sections/1" studio="Walt Disney Pictures" type="movie" title="Moana" contentRating="PG" summary="In Ancient Polynesia, when a terrible curse incurred by Maui reaches an impetuous Chieftain's daughter's island, she answers the Ocean's call to seek out the demigod to set things right." rating="9.5" audienceRating="8.9" viewOffset="436000" viewCount="7" lastViewedAt="1536022559" year="2016" tagline="The ocean is calling." thumb="/library/metadata/1143317/thumb/1535222132" art="/library/metadata/1143317/art/1535222132" duration="6432810" originallyAvailableAt="2016-11-23" addedAt="1491952229" updatedAt="1535222132" audienceRatingImage="rottentomatoes://image.rating.upright" chapterSource="mixed" primaryExtraKey="/library/metadata/1143318" ratingImage="rottentomatoes://image.rating.certified">
<Media videoResolution="1080" id="1849679" duration="6432810" bitrate="29085" width="1920" height="1080" aspectRatio="1.78" audioChannels="8" audioCodec="dca-ma" videoCodec="h264" container="mkv" videoFrameRate="24p" audioProfile="ma" videoProfile="high">
<Part accessible="1" exists="1" id="1849688" key="/library/parts/1849688/1491951135/file.mkv" duration="6432810" file="\\NETWORKSTORAGE\Video\BluRays\Moana.mkv" size="23387230820" audioProfile="ma" container="mkv" deepAnalysisVersion="2" indexes="sd" requiredBandwidths="36324,35172,33886,32188,30736,30736,30736,30736" videoProfile="high">
<Stream id="3213552" streamType="1" codec="h264" index="0" bitrate="28317" language="English" languageCode="eng" bitDepth="8" chromaLocation="left" chromaSubsampling="4:2:0" frameRate="23.976" hasScalingMatrix="0" height="1080" level="41" profile="high" refFrames="4" requiredBandwidths="30869,29892,28211,26513,25808,25808,25808,25808" scanType="progressive" width="1920" displayTitle="English (H.264 High)"/>
<Stream id="3213553" streamType="2" selected="1" default="1" codec="dca" index="1" channels="8" bitrate="768" language="English" languageCode="eng" audioChannelLayout="7.1" bitDepth="24" profile="ma" requiredBandwidths="5317,5182,4959,4809,4734,4734,4734,4734" samplingRate="48000" title="Surround 7.1" displayTitle="Surround 7.1 (English DTS-HD MA)"/>
<Stream id="3213554" streamType="3" codec="pgs" index="2" language="English" languageCode="eng" requiredBandwidths="49,49,49,49,49,49,49,49" displayTitle="English (PGS)"/>
<Stream id="3213555" streamType="3" codec="pgs" index="3" language="English" languageCode="eng" requiredBandwidths="47,47,47,47,47,47,47,47" displayTitle="English (PGS)"/>
<Stream id="3213556" streamType="3" codec="pgs" index="4" language="English" languageCode="eng" requiredBandwidths="101,101,101,101,101,101,101,101" displayTitle="English (PGS)"/>
<Stream id="3213557" streamType="3" codec="pgs" index="5" language="English" languageCode="eng" requiredBandwidths="96,96,96,96,96,96,96,96" displayTitle="English (PGS)"/>
</Part>
</Media>
<Genre id="14751" filter="genre=14751" tag="Adventure"/>
<Genre id="682" filter="genre=682" tag="Family"/>
<Genre id="4033" filter="genre=4033" tag="Musical"/>
<Genre id="21" filter="genre=21" tag="Comedy"/>
<Genre id="927" filter="genre=927" tag="Animation"/>
<Genre id="267" filter="genre=267" tag="Fantasy"/>
<Director id="75980" filter="director=75980" tag="Ron Clements"/>
<Director id="75979" filter="director=75979" tag="John Musker"/>
<Writer id="83513" filter="writer=83513" tag="Jared Bush"/>
<Producer id="112529" filter="producer=112529" tag="Osnat Shurer"/>
<Country id="25" filter="country=25" tag="USA"/>
<Role id="112523" filter="actor=112523" tag="Auli'i Cravalho" role="Moana (voice)" thumb="http://image.tmdb.org/t/p/original/av5ZZ67BlHCzyWrUBg5xTUNGiWq.jpg"/>
<Role id="69448" filter="actor=69448" tag="Dwayne Johnson" role="Maui (voice)" thumb="http://image.tmdb.org/t/p/original/akweMz59qsSoPUJYe7QpjAc2rQp.jpg"/>
<Role id="112524" filter="actor=112524" tag="Rachel House" role="Gramma Tala (voice)" thumb="http://image.tmdb.org/t/p/original/8UGo2lHG5wtnH55lKPDm8oJ0IOk.jpg"/>
<Role id="74991" filter="actor=74991" tag="Temuera Morrison" role="Chief Tui (voice)" thumb="http://image.tmdb.org/t/p/original/A1nD5J5uRwJM4hnpXd3DdmwZGjP.jpg"/>
<Role id="68755" filter="actor=68755" tag="Jemaine Clement" role="Tamatoa (voice)" thumb="http://image.tmdb.org/t/p/original/crxCXudFMxuPqrYqYiTYKbhImhv.jpg"/>
<Role id="112525" filter="actor=112525" tag="Nicole Scherzinger" role="Sina (voice)" thumb="http://image.tmdb.org/t/p/original/aWO7fZN4W7ua4MVoruG0ZeEXur9.jpg"/>
<Role id="67251" filter="actor=67251" tag="Alan Tudyk" role="Heihei / Villager #3 (voice)" thumb="http://image.tmdb.org/t/p/original/6QuMtbD8kmhpwWhFKfNzEvHRLOu.jpg"/>
<Role id="112526" filter="actor=112526" tag="Oscar Kightley" role="Fisherman (voice)" thumb="http://image.tmdb.org/t/p/original/7yaqZT5e1UlxBmqQ3xpXAUP7SNL.jpg"/>
<Role id="78810" filter="actor=78810" tag="Troy Polamalu" role="Villager #1 (voice)" thumb="http://image.tmdb.org/t/p/original/51rD9ZZYyXNmk7xiotiVBqhBHqS.jpg"/>
<Role id="112527" filter="actor=112527" tag="Puanani Cravalho" role="Villager #2 (voice)" thumb="http://image.tmdb.org/t/p/original/qPxMhzDmrvuIQZCeamiUzynLEFz.jpg"/>
<Role id="112528" filter="actor=112528" tag="Louise Bush" role="Toddler Moana (voice)"/>
<Role id="89414" filter="actor=89414" tag="Chris Jackson" role="Chief Tui (singing voice)" thumb="http://image.tmdb.org/t/p/original/iczG0WVwwifbOTY5JWvBVz9DVaj.jpg"/>
<Chapter id="112530" filter="thumb=112530" tag="Tala's Tale" index="1" startTimeOffset="435685" endTimeOffset="719802" thumb="/library/media/1849679/chapterImages/1"/>
<Chapter id="112531" filter="thumb=112531" tag=""Where You Are"" index="2" startTimeOffset="0" endTimeOffset="435685" thumb="/library/media/1849679/chapterImages/2"/>
<Chapter id="112532" filter="thumb=112532" tag="Motunui" index="3" startTimeOffset="1682806" endTimeOffset="1931137" thumb="/library/media/1849679/chapterImages/3"/>
<Chapter id="112533" filter="thumb=112533" tag=""How Far I'll Go"" index="4" startTimeOffset="2950322" endTimeOffset="3201031" thumb="/library/media/1849679/chapterImages/4"/>
<Chapter id="112534" filter="thumb=112534" tag=""We Know the Way"" index="5" startTimeOffset="719802" endTimeOffset="973764" thumb="/library/media/1849679/chapterImages/5"/>
<Chapter id="112535" filter="thumb=112535" tag="Beyond the Reef" index="6" startTimeOffset="5773726" endTimeOffset="6432810" thumb="/library/media/1849679/chapterImages/6"/>
<Chapter id="112536" filter="thumb=112536" tag=""The Ocean Is a Friend of Mine"" index="7" startTimeOffset="4246075" endTimeOffset="4371950" thumb="/library/media/1849679/chapterImages/7"/>
<Chapter id="112537" filter="thumb=112537" tag=""You're Welcome"" index="8" startTimeOffset="4371950" endTimeOffset="4542120" thumb="/library/media/1849679/chapterImages/8"/>
<Chapter id="112538" filter="thumb=112538" tag=""You Will Restore the Heart"" index="9" startTimeOffset="2496869" endTimeOffset="2704868" thumb="/library/media/1849679/chapterImages/9"/>
<Chapter id="112539" filter="thumb=112539" tag="Beware the Kakamora" index="10" startTimeOffset="4997409" endTimeOffset="5390927" thumb="/library/media/1849679/chapterImages/10"/>
<Chapter id="112540" filter="thumb=112540" tag=""Hero to All"" index="11" startTimeOffset="973764" endTimeOffset="1289579" thumb="/library/media/1849679/chapterImages/11"/>
<Chapter id="112541" filter="thumb=112541" tag="The Realm of Monsters" index="12" startTimeOffset="3453324" endTimeOffset="3945024" thumb="/library/media/1849679/chapterImages/12"/>
<Chapter id="112542" filter="thumb=112542" tag=""Shiny"" index="13" startTimeOffset="4542120" endTimeOffset="4997409" thumb="/library/media/1849679/chapterImages/13"/>
<Chapter id="112543" filter="thumb=112543" tag="Every Picture Tells a Story" index="14" startTimeOffset="3945024" endTimeOffset="4246075" thumb="/library/media/1849679/chapterImages/14"/>
<Chapter id="112544" filter="thumb=112544" tag="Wayfinding" index="15" startTimeOffset="3201031" endTimeOffset="3453324" thumb="/library/media/1849679/chapterImages/15"/>
<Chapter id="112545" filter="thumb=112545" tag="Te Ka" index="16" startTimeOffset="2116280" endTimeOffset="2496869" thumb="/library/media/1849679/chapterImages/16"/>
<Chapter id="112546" filter="thumb=112546" tag=""I Am Moana"" index="17" startTimeOffset="1931137" endTimeOffset="2116280" thumb="/library/media/1849679/chapterImages/17"/>
<Chapter id="112547" filter="thumb=112547" tag=""Returning the Heart"" index="18" startTimeOffset="2704868" endTimeOffset="2950322" thumb="/library/media/1849679/chapterImages/18"/>
<Chapter id="112548" filter="thumb=112548" tag="Te Fiti" index="19" startTimeOffset="1289579" endTimeOffset="1682806" thumb="/library/media/1849679/chapterImages/19"/>
<Chapter id="57691" filter="thumb=57691" tag="End Credits" index="20" startTimeOffset="5390927" endTimeOffset="5773726" thumb="/library/media/1849679/chapterImages/20"/>
</Video>
</MediaContainer>
