Hi
I think You have send an access to me by mistake, but I've logged and checked it. For me it looks like You are doing well with Grid module, the problem with duplicated content is that modules with ID 819 and 823 are showing the same image as a result. First is set to show latest user and other a latest picture added. Which is the same image
Please let me know what You need to know about Grid module and I'll explain.