For some reason a large portion of my music had its album art changed to a different album. As an example, a track clearly says "Queen" "Death on Two Legs" and "A Night at the Opera" but the album art shown is for Queen's Greatest Hits instead of A Night at the Opera. This happened to hundreds of my tracks, with most of the album art changing to a Greatest Hits or Best Of type of album art instead of the correct album. How can I get Spotify to link to the correct album art?

P.S. – these are of course for actual spotify tracks. I have not imported any other music into spotify. The problem is the same for all my devices (desktop, phone, tablet) but is worse on the iPhone and iPad.