Songs Replacing Each Other

For some reason I seem to have a problem adding all the songs from a Led Zepplin album into my collection. Certain songs will replace certain other songs when I add them. When I selected all 54 songs in the album, I dragged them into zune and it said it found 54 items and had added them. However once I look thru the led zepplin folder it only has 41 songs in it. I tried adding one of the songs that didn't get added, and it worked, but replaced two other songs that had previously been in there.

What the hell is going on?

Are you sure that Led Zeppelin is the main artist for all of the songs? Some of the songs may cite an individual artist for the song and place it under their name, such as Jimmy Page or Robert Plant.

no, they are all definately led zepplin.

Another thing I noticed is that some of the songs are actually incorrectly named in the zune program, and in order to fix them I will have to delete them from my collection and then play the song using the program before I can re-add it.