It may not be so much suspicious as it was annoying as hell to watch. I had a limit order open for several days at .28 and then watched a pile of orders executed at .274 ish and below. It even closed at .27 while my order sat in the corner with a dunce cap. It wasn't even AON. Then Zecco gives me some garbage excuse about market order priority and low volume.
Zecco dropped the ball for me yesterday so I was just venting. I think jacktrades had it right when he said you get what you pay for.
Nice grab though. No doubt those 27s will pay you back soon enough.