I just hooked up my Rambo 1.3 board and downloaded my firmware onto it. The printer configuration is a delta. When we try to move the head only one motor will move. The other two seem to just lurch forward and then backward. When we unplug the motor that works and plug it into the one of the steppers that werent working they start to work. Any advice on how to fix this issue or where it might be occuring at?