I am using Sterling and every time I enter an order, for example buy 100 of XXX at a limit price, an identical order at the same time and price will be entered from ISE and EAB. My order will be listed ahead based on time but it will not be two seconds until an order for 200 shares at the same limit price will be entered from NASDQ, etc. which comes ahead of my order. Is anyone else experiencing this problem? The three "P's" are killing small traders trying to scalp.