Songs not downloading in order

Hi, this has happened to me randomly twice and I don't know why.

Two CDs I bought off of iTunes have all the songs downloaded but instead of going in order by number on CD, they get organized by artist, even if I have the thing set on "album". In the info it recognizes the number order, but it's still seperated by artist. It's not a huge problem, I still have all the songs, but both CDs are soundtracks and I would like the songs to be in order.