Okay so your naming is poor for plex to understand which is why its getting all mixed up. Please see Naming and Organizing Your TV Show Files | Plex Support for reference.
For this show rename the top level folder to add the year which plex will use as a hint in matching Star Trek: Discovery (2017). Even better is to add a matching id like this but that is optional Star Trek: Discovery (2017) {tmdb-67198} which is what I do as plex will then match exactly with the ID.
The name of your files need to change from S1 01 to at least have S01E01 in them. So, use Star Trek Discovery - S01E01 - The Vulcan Hello.ext as an example.
I would also suggest doing a FULL plex dance on the show as plex can get in a muddle if stuff is not named right when its scanned so best to do that procedure to clean up.
Semi recent scanner changes has caused folks issues and while poorly named media in the past might have worked it may not anymore.
