Occasionally there are shows that give Plex trouble.
The new Plex Movie and TV Show scanners/agents are more stringent on naming and organization than the legacy scanners/agents. Follow the support document as closely as possible.
Adding the TVDB or TMDB ID to the show folder almost always ensures a correct match. IMDB IDs are not supported for TV shows. The ID must be in curly braces, not square brackets, parenthesis, etc.
Since Plex matched the show incorrectly, be sure and Plex Dance the entire show after renaming/reorganizing. This clears the incorrect matching information from the Plex database.
If none of the above work, can you provide a screenshot, directory listing, etc how you have the show named and organized, including which folder is added to the Plex library? Others can try to replicate and help find a solution.
