I wonder how Plex could match that name incorrectly… sorry, sarcasm comes naturally but doesn’t suit me well 
Inside Plex your best shot is to filter your library by duplicates. If the rest of your media is better prepared, you should be able to find it that way. An alternative might be to remove the file, scan your library and empty the trash in order to start over with that show.
If you need to dig deeper into that beehive… there’s apps like Web Tools / Export Tools that you can use to create an overview of your server content – including file names and what they’re associated with.
