Authorize purchased songs

I have two albums purchased from iTunes where, 1 to 3 songs that are part of the album are not authorized for my computer ?!?!? When I click on them I am prompted to authorize them with userid and PW. I do, it accepts and does nothing to remedy. Song info under the edit button says it is purchased by me on the date the album was purchased. Difference between offending song and others in album is that it is listed as AAC Audio File. Good songs are listed as Purchased AAC Audio File. I remind the reader that these songs are a part of a purchased album.