Window Motor - Problem with victors?

[Team2191]

Our team is using two window motors in unison to control a spool on our robot. They're connected to victors which are connected to 40 amp breakers on the pdb. In labview, i have them programmed so that button 1 pressed = motors going forward, button 2 pressed = motors going in reverse. Button 2 works completely fine, but when i try button one, the motor is jumpy, and moves randomly. I know that there's nothing in my code that would make the victors do that, and i know that the window motors are good. Has anyone experienced this problem before?