It sounds pretty dodgy to me. If I enter a price and it gaps up on open, I'd be left on the bid at the price I set, so there's a nasty little loophole with your brokers ynot so that they get your brokerage money perhaps?
Look at Bell Direct or one of the majors imo so you know what you are dealing with. I'd be angry enough to phone and insist that they reverse the trade as you didn't ask to pay MORE, ormarket - but I haven't seen what you clicked in 'fine print'.
