I have an over-hung bar with two rollers on top and two offset to the right on the bottom. All four rollers are set to 'no penetration' with the bar, respectively. However, when I run the FEA with a load on the left-most roller in a downward direction I don't see equal and opposite forces among the contact sets. I *should* see a downward force on the top left, downward on the top right, upward on the bottom left and zero on the bottom right (like the crude sketch below).
Instead I am seeing an upward force from the bottom right roller and zero on the bottom left. Also, the forces don't balance.