Plex is very picky with TV show naming and directory structure. Try using Plex naming and organization guidelines.
See Your Media → TV Show Files (Naming and Organizing).
When renaming and reorganizing, Plex Dance the entire show. This will remove the mismatched information from the Plex Server database.
For example, this matched without issue for me:
/A TV Show Library <-- TV Library points here
/Perry Mason (2020)
/Season 01
/Perry Mason (2020) - s01e01.mkv
/Perry Mason (2020) - s01e02.mkv
/Perry Mason (2020) - s01e03.mkv
/Perry Mason (2020) - s01e04.mkv
Edit: LOL: Australia did not auto match. The manual match found it immediately.
