I just double checked this on the Stratocruiser and it looks okay to me (100% positive). Remember, right rudder trim should make the Tab go left, and vice versa. I'm running COTS version 1.1. If you still are seeing a discrepancy, then make sure that your trim tab controls aren't reversed, and corroborate it with the indicator on the pedestal.
(the effectiveness of the rudder trim seems to be a extremely weak, now that I happen to be trying it out, but it isn't reversed)
thats right. From my last flight i remembered a rudder deflection to the left using trim wheel (trim left) but rudder trim tab also deflects to the left. I will double check that again next time