This type of order imbalance occurs from time to time on GLOBEX. Usually it's with less liquid contracts, but QM can be illiquid at times. If I remember correctly it has to do with the algorithm GLOBEX uses, and it will keep running up (or down) the price until it resets after a few seconds.
I remember getting nailed by a spike like this on ER2 at 4:01 PM EST once, but the trade was later busted. However only some trades were busted, some people got nailed if they were outside the bust range.