Half Sidecar PWM Ports Working

[afclsn]

This is team 4474, posting during our second FRC season. It seems that the first 4 PWM ports in our sidecar don't respond correctly. Ports 1 and 2 output "forward" to out motor controllers while ports 3 and 4 output "reverse" at all times. Ports 5 through 10 work just fine. We've tried two different sidecars, several different serial cables, and two different cRIOs with the exact same results. The battery voltage was near full when we tested it as well. Help would be greatly appreciated!