Ever since the last sync of my iPhone (1 week ago), the album covers of some songs (not all) have 4 images of various albums instead of 1. The four images are not even the correct album for the song. iTunes library (on the PC) is fine... the problem only occurs on the iPhone. Any suggestions?

Have you tried synching again?

I performed a sync last night and it didn't correct the problem. Still the same issues on the iPhone... however, the iTunes library on the PC are fine.

Delete the album art and redownload it from iTunes