I dare you to share screenshots of the Library config, showing the folders referenced.
I double-dog dare you to share screenshots of the show folder names, season folder names and episode file names.
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Have you tried viewing the library for duplicates, or viewing by folder to identify items that may have been matched to other shows?
The most likely root cause of that would still be file naming, but it would also require a Plex Dance to fix after addressing naming.
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If you believe there’s a bug, I triple-dog dare you to share both naming screenshots and server logs.
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Or maybe we’re all idiots. That’s possible too.