If you don't have the "Remove Rough Image Matches" checked when doing this then yes. EmuMovies tends to have a lot of images that look the same to ours but are different files (their file hashes don't match ours). Because of this you will often see you grabbing several images that look the same but file size is a byte or two different. The "Remove Rough Image Matches" button will attempt to look at both images and remove files that similar in content to one another to help eliminate this issue. Another thing that could help would be to set media limits on your download, this will stop you from grabbing as many files and thus the number of potential duplicates you're grabbing.