Combining albums leaves leftover song
So I buy albums of music that have 4-6 discs in them and I know to change them all to the same album name for them to be combined. However, recently, when I do that, there appears to be leftover songs that just do not want to combine with the rest of the album no matter how I try to match up the info.
For example:
Import Album Disc 1.
Import Album Disc 2.
Merge albums.
Last song of Disc 2 doesn't merge.
Import Album Disc 3.
Merge albums.
Now the leftover song from Disc 2 is merged, but the last song of Disc 3 is not in the album.
Import Album Disc 4.
Merge albums.
Leftover song from Disc 3 is merged but now last song of Disc 4 is not.
This is driving me nuts. NUTS, I SAY! I thought that maybe closing and reopening itunes or restarting my computer would help, but it doesn't. However, when I sync itunes from the computer to my ipod, then on the ipod, all the songs appear in one album but on the computer the leftover song is still separate. :/ I really don't know what to do. I don't know why I can't just drag and drop the leftover song in the album myself.