Hey Germinal, not sure this is a bug or not. I created album X from 1962 en Muscol using discogs. Then I got really lazy about adding the songs info so I pull the album again using ID3 tags (my ID3 tags have the A/B side info already). I didn't have the same version but a 2004 reissue with a different songlist (bonus tracks etc.). Instead of creating a new album X from 2004, Muscol added the songs to album X from 1962.