Try and swap an esc from one side to the other see if the speed of the motor follows the esc.
Show us a picture of the esc or a link where you bought them from.
I can't switch ESC's atm, I don't have access to the soldering machine.
http://www.ebay.com/itm/360695582267?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 - this is where I bought the item from.