Anyone know this is all about? Just started the other day. Seeing two entries in the same library. Confirmed there is only one file it can be picking up on…
Probably helps to provide screenshot :-/

Ok Looks to be it is auto creating collections.
Possible bug?
https://support.plex.tv/articles/201273953-collections/
See FAQ section:
Where did all these extra collections come from? I didn’t add them.
You may enabled theUse collection info from The Movie Databasemetadata agent setting. When enabled (it is disabled by default), that will try to gather collection information from The Movie Database. This may cause many unwanted collections to be automatically created, particularly collections where you only have one item.
THAT…
or you’re using mp4/m4v files with embedded metadata (album tag) and the local media assets enabled.
Yup. I literally just found that…
Disregard.
facepalm
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