i think this specific situation is probably due to the speed at which the auction has to run in order to sell the amount of lots they do in one day. ive been to morphy auctions, they cruise quickly... and they admit that in the event of a tie bid, the floor gets the bid (understandably so)... in this case, it appears it both the floor and online thought they had the bid and after the lot was done they had to choose one without the option of going back.
not defending morphy's, but at the speed they run and the many different platforms they list on... I would imagine this happens a couple times every auction