When you create a TV library in the set up process you can change the agent to Personal Media Shows in the advanced tab. This is basically the same as an “other videos” library and not grab online data but it will allow you to keep things in a Seasons and episodes format. (which allows for things Like On Deck and such to work.) It will need the proper naming with the S01E01
I don’t know what type of files you have but It will still grab embedded metadata in an MP4 file if you have local media assets turned on for personal media and if the file has a date or something in it’s metadata title field may be the reason it is doing that. it might be getting the episode numbers wrong because of some embedded metadata too. but i don’t want to make assumptions about your files. If they are MKVs it should not do that.
I would remove the file(s) completely out of the main folder it is looking at for library to do the “dance”
Why wouldn’t we admit that? That is what the Plex Dance is for, to remove that cache of data. There is also http caches in the servers plugin support folder. No one has ever asked so directly before at least not to me that i recall. The dance is just easier to explain than searching database or metadata bundles with long GUIDs as files names that won’t make any sense.