You must have more than one album cover for that album.
What happens when you click the button on the right?
Try this:
In iTunes, select the first song in that Billy Joel album and Get Info on it. Click on the Artwork tab. Is there more than one image in there? If so, you can leave it if you wish or you can delete the one you don't want and keep hitting the Next button and deleting the superfluous image for each song in the album.