problem with reaction moments

Hello All

I have a problem - i'm doing a static analysis of two cars connected by a rigid rod (the rod is actually a 3 dof cardan where all of the dof's are locked)

When getting a moment reaction graph the resualts do not make sense - I have moments even when the angle is 0 (180) deg between the bodies.

you help is much appriciated.

the recction moment that i'm looking is on Concentric16

thanks very much

SolidworksMotion Studies