Hate to Butt in here.. however, at one time I thought I had same pictures twice (though had not hit the extra charge point anyway) and I did have the twice and a few 3 times. HOWEVER, I actually found I uploaded them twice and thrice accidentally. I loaded them and did not use them, reloaded a week or so later again not realizing I had previously done. No I was not new then, I just was not paying close attention. Now I label all of the photos BEFORE I load and can put in name order & am able to see which have been loaded twice by just having them order them by name.
May not be your issue, but it was mine and is VERY easy to happen.
Vickie