I had something similar happen with purchasing something on Amazon once a year or so ago. They sent me two order confirmation emails with different order numbers, but I was luckily only charged once. When I called to see what happened (it was a big order, and I freaked out), they told me that they had some glitch and the first order was voided as soon as the second one was issued.
Haven't had anything similar happen with ebook purchases, though.
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