I know my wife somehow ordered 10 sets for me as I was stuck in a meeting when these went on sale. She tried to pay via credit card then hit back arrow and then paid with paypal instead and the cart got updated with 10(we can't think of any other way as to how 10 got in the cart on the single order). Topps rightfully cancelled 5 of the sets and those sets should be part of the stash to go to the folks who got shut out completely. This means there should be at least 5 sets in the queue to be sent out to the folks that were shutout.
Sounds somewhat similar to how I jacked up Greg's forum. I attempted a task (which did not work), and then proceeded to do another task,
without closing my browser and starting a new session, which was a mistake. When I tried again (without creating a fresh browser session), all hell broke loose and the indexing became screwed up because of the bug in my session. If you try to do something online, and it doesn't work, or you change your mind, be sure to close your browser and then open a new browser before proceeding. Otherwise, you are susceptible to all sorts of mayhem, like trying to purchase one item but then ordering 10. I don't know much about computers, but I think this idea is sound and may have contributed to your situation . . . which of course, was not the end of the world
(As we know it, and I feel fine)