I commented on my friend's facebook photo, now everytime he posts a new photo, my comment reappears?

My friend posted a picture on his facebook wall using his Blackberry. I made a comment on it. Now everytime he posts a new picture on his wall, my comment automatically reappears on every one of his wall pictures but with the original date. It looks as though I copied and pasted the same comment all over his wall. When I comment on other people's pictures, this does not happen, it only shows up on the picture that I actually commented on. All of the photos are from the "Mobile Upload" album. I though that maybe I commented on the album rather than the picture and that is why it keeps reappearing since the pictures are all linked to the same album, but I tried this on another friend's "Mobile Upload" album and my comment did not reappear when they posted more pictures to their wall with their phone. Does anyone know what is going on?