Before this never happen like that. There only 1 box for the thumbnail whenever member upload. I just login as " Angkor408" it show 2 thumbnail got the same picture and 1 thumnail that is different, eventhough I havent submit the photo yet. I have to select uncheck the thumnail that I dont want display,than it will not show duplicate. For some reason, there a cache generate on the the username and same picture which causes to show few checkbox in thumbnail. I did a scan database but didn't help. So I guess I have to manually uncheck the thumnail to show only once.