Firs, I'm not American... sorry by my english, ok!?
If the tag of each song doesn't match same artist, album, etc, iTunes will sort by others criteria. So, all you have to do is select all the songs of your album, right click, Get Info, Info (tab). Retype all shared informations like Artist, Year, Album etc.
I had about 6 tracks that wouldn't sort right. It was due to them having "Album Artist" info that the other tracks didn't have. Still completely retarded that they were all the same album and just to that extra info it wouldn't sort them right.