Solution:
Ok, after extensive testing I found the issue. Dont use Button 28 and Axis X.
When I set my CL2 to the Honeycomb Bravo axis “Joystick R-Axis X” then the RMB click moves the CL from FUEL SO to FTR.
When I set the CL2 axis to the left by one to “Joystick R-Axis Y”, the issue is gone.