Yeah i think its happened to me too.. its usually for very very very high volume shows.k. I think the program has so many orders coming in within the first few seconds that it can't differentiate and gives them all tickets.. then catches up with itself and realizes its allocated too many tickets to carts....that would be my guess.. how it decides to cancel them is anybody's guess.. in other words which ones get cancelled if there are say 100 orders with the exact same time? if that is the way it works it does seem unfair because it means it is literally a lottery...