Andy mark mechanum problem

[baronep]

So my team is having some issues with the Andy Mark 6" mechanums. They are in the correct orientation (X from the top) and they spin in the correct direction when they are on jacks, but they refuse to strafe side to side. Instead they follow a diagonal curving path. (Forward and to the left for a left strafe and backward and to the right for a right strafe).

Things we have tries:
Calibrating the Jags
Testing the output voltage on jags
attaching extra batteries to try different weight distributions (but i'm not sure the weight distribution is not the problem)
the rollers seem to roll fine
one of the mechanums wobbles when it runs and another is at a slight angle in relation to the frame (<10 degrees off)

Has anyone experienced this problem before?

Thanks

-baronep