Plex scans TV show totally incorrect

I find the most important feature that Plex relies on to match a show correctly, is the base folder that contains the rest. If this is incorrectly named, or includes the wrong date (or no date), Plex can confuse it for another show easily.

Assuming that the show is Keeping Up Appearances - TheTVDB.com, make sure the folder is titled Keeping Up Appearances (1990). If this doesn’t do it (might need to Plex dance the files after renaming it), I’ll need to see the folder names/structures you use, as tom80H said.