A kind of similar thing happened to me where I added a music album. It had some weird duplication issue where 2 album entries were created: one entry with all the proper metadata that did not correctly link to the files and one with no metadata besides song names that did link to the files. I had to remove all the files of the artist from my library so Jellyfin could completely remove the album entry. Then, when I added the artist back it read the album properly without duplication.
TLDR try removing the entire show and waiting for Jellyfin to wipe it from the library