I have explained that already in other threads: Plex now needs a strict folder structure.
Music > Album Artist > Album Title > Tracks
which means that within any ‘Album Artist’ folder, there must be only albums by one particular album artist.
If you put in only one album by a different album artist + you have ‘Prefer Local Metadata’ activated, then this different album artist can “taint” or overwrite the album artist of all the other albums in there.
In this case, ‘The Muppets’ have tainted the artist ‘Various Artists’.
You need to find that album with The Muppets as ‘Album Artist’ and remove it from the folder ‘Various Artists’. Put it into its own ‘The Muppets’ artist folder.
Then use ‘Fix Match’ on the overwritten ‘Various Artists’ “artist” to rectify the wrong name and bio.
