Strange, it's probably another edge case with the database I haven't considered.
I'm going to be pretty busy for the next week or so (bunch of assignments for university due soon) and don't have time to look into this atm, but I'll keep you posted once I have time again.

legacychimera247 commented
Hello, i do have some artists that are placed weirdly on the artist list, i'll give you an example
i have a folder with all the doctor who theme songs plus remixes, and they are organized with "Various Artists" as album artist tag, then the author of the song/theme as artist and Doctor Who as album artist sort
in this folder there is also a remix from electronic group Orbital, which is tagged in the same way (Various Artists, Orbital and Doctor Who)
with this, all my orbital records, are showed in Doctor Who, despite being tagged as just orbital in either artist and album artist
if i remove that one single song from them in the doctor who folder they will show up correctly at the O letter
now, there might be other example of this but i cannot be sure about, and that was the most evident as i couldn't find orbital anymore
any hint to solve this?