There are so many movies and shows having this issue. The worst is the overlapping genres imo. It truly makes no sense to fetch genres from various sources at the same time.
But this is a deep running problem with Plex. They seem to pick quantity (more sources) over quality data in several places. There is this problem with genres but also:
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They insist on using weird sources for release dates, even when they know they are incorrect. Incorrect partial metadata: Laid to Rest - #2 by OttoKerner
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They insist on using weird sources for Album Reviews even when they know they are in the wrong language Getting lots of German album reviews?