This one is dangerous. I sniped $12.52 and AS submitted a bid of $15.52. I won the auction at $15.15, but I wouldn't have bid that much.
Is this a bug? I swear I submitted $12.52
Its ebay item #1744501154
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UMfanatic, did you use your numbers pad to enter the amount of your bid? If so, please note that the 5 is directly above the 2 and there's a distinct possibility of hitting 5 instead of 2.
It would be unheard of (sometimes unfortunately) for AS to bid more than you entered. Very high probability here that you entered the $15 rather than the $12.
I always double check (sometimes triple)my bids to make certain the bid amount is correct....pays to be attentive. Recently I was sure I had bid but realised I hadn't when I checked again. Easy to get caught up when watching auctions ending. 
He's a link to eBays bid increment page:
http://pages.ebay.com/help/basics/g-bid-increment.html
http://pages.ebay.com/help/basics/g-bid-increment.html