Moving from Plex to Jellyfin

[BlimBlamSmashySmash]

Which is weird because it works fine for every single of the 5,100+ films I added, but not for the TV shows. Is there a reason you could think of to explain that? Also, I figured there were some changes required as I mentioned in my post, so my question was more about finding an automated, or more automated way than renaming each file one at a time. There are more than 20k files to change.