You should review your file naming / folder organization.
Especially when it comes to the season folder – don’t use localized naming or a mix of show name, season number and other information.
Example
Wrong
Series
Mandalorian
The Mandalorian tomporada 1 complete...
...
Right
Series
The Mandalorian
Season 01
Similarly, don’t have multiple season 2 folders – just 1!!
Plex will also prefer the episode files to use s01e01 schema instead of 1x01– but for all I’ve seen the 1x01 style season/episode naming should be working.
After renaming those season folders, you might need to perform the so called Plex Dance to make Plex forget it already incorrectly identified those episodes (or ignored them).
