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Change the sorting order in your library to something else than “by Title”.
Does the number change? If it does, you have some collections in there, whose members are hidden and not counted. Collections | Plex Support -
Use the “Duplicate” filter to find out if more than one video file has been matched to the same movie title.
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Look for reserved words in your file names. Those files are ignored Special Keyword File/Folder Exclusion | Plex Support
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Look for file names ending in
pt2orpart2ordisc2etc. Those files may get combined with theirpt1etc. named counterparts. Naming and organizing your Movie files | Plex Support -
Disc images and DVD /Bluray folder structures are not supported in Plex ISO, IMG, and Video_TS Movie files | Plex Support
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Mini-series are not movies and thus don’t get metadata.
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Files which are named like episodes of a tv show Naming and Organizing Your TV Show Files | Plex Support are ignored in a movie library (and vice versa).