Why do compilation albums sometimes show up as 100s of identical album covers? Does anyone know, why some compilation albums (purchased on iTunes Shop) sometimes appear as 100s of album covers in the album overview?   (as opposed to what one would expect, just 1 album or atleast 1 per CD)

(would have posted a picture here to show what I mean, but I am apparently not allowed to)

And, probably more importantly, what's the fix?   I've been meddling around with "compilation" properties on the songs, but that doesn't seem to help much. This is really annoying me lol, almost to the point of me considering just deleting the albums only to get rid of this...   hoping someone has an alternative suggestion ;-)
It's possible the "Part of a compilation" meta data wasn't set for these tracks. You can group them together as a single "album" in iTunes by:


Selecting all the tracks you want to come from the same album (use Cmd-Left Click to select multiple, non-contiguous tracks) 
Hitting ⌘-I to bring up the meta-data editor window and then: 


For the Album Arist field enter: Various Arists
For the Album field enter the name of the compilation album
And then make sure the Part of a compilation option box is checked

Click OK to apply the changes to all the tracks


You should now see them grouped together in the grid view as one album, all showing (hopefully) the same cover art. If they're not showing the same cover art:


Find the cover art you like.
Copy it to the clipboard with ⌘-C
select all the tracks again and open the meta-data editor window.
Click once in the Artwork window and hit ⌘-V to paste the cover art to all the tracks.
Click OK to add the cover art to every track in the compilation.