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@benjaminbunny
From looking at a few of the filenames, it looks like the users original filename is retained when the picture is uploaded and that all the pictures are stored in the same folder.
So if you upload a picture with the same name as an existing picture it will replace that one.
I started working on a similar kind of user picture upload for one of my sites a while ago and came up with some php code that would add the date and time the picture was uploaded to the end of the filename.