Compilations at end?

[simoncn]

Have you tried removing Various Artists from this other setting?

The only other explanations are that you have an AlbumArtistSort tag for Various Artists somewhere or you have Various Artists tagged as Artist somewhere.

To check these, you can add AlbumArtistSort to indexTags and you can look in the All Artists index for Various Artists.

As it only happens with one value for AlbumArtist, it seems likely to be a tagging issue with that tag value.