I use Emby (jellyfin is a fork of Emby right) and I think it’s just a limitation of how it’s written where you can’t customize the regex that it uses to identify the show. I had this happen for Naruto Shippuden where it thinks they are the movies rather than the show, because anime has problems with how it defines seasons , I don’t think there is a way to fix it other than a code change at the source , and manually changing the metadata yourself in the meantime