Drive Train Curves Only While Backing Up

[Ozuru]

Hello,

For some reason our drive train is curving to the right only when we backup. When we use the joysticks, it does not curve. When we set the talon manually (Talon.set(-1)), it curves to the right pretty severely.

We're using a 6-wheel drive train (3 on each side) with a mini toughbox. Our motors are 4 KoP CIM motors and we're using 4 talons for our motor controllers. We're splitting the PWM cable so we're only using two PWM cables to access the 4 talons. We're kind of unsure what this could be so I was wondering if anyone had an issue like this before or what your ideas might be as to what's causing it.

Thanks!