I've been having the same problem in the gallery with my uploads for weeks.
I make sim households and upload a fair bit. I have quite a number of followers who download them. I LOVE doing this.
Recently, I've spotted that my uploads are duplicating. In twos, then after a while, threes, then after scrolling a few down, they're appearing groups of 4, 5, 6 and even up to 9 and 10. These are not multiple uploads, each item has the same number of faves/downloads. I've deleted HUNDREDS and I've noticed if I delete all the duplicates, the one I'm attempting to delete goes too. So despite dozens of copies showing up, there is only one there. There are no duplicatations in My Library. I haven't uploaded more than once, the gallery is just crazy.
I have every pack, so I've spent hundred of £s on this game. I almost entirely use it for create a sim, not so much gameplay. I just love creating characters, but my game is ruined now. It's totally unmanageable. Two days ago I bought a new PC (not for this reason - my old one's battery died). Re-uploading game and all my expansions took 6 hours. I was hoping and hoping this would resolve the fault / bug in my uploads, but it didn't. My new PC with all the reinstalled games and expansions, and packs has the bugged gallery too.
Please help!!!