Hi netboss,
Other things that would effect this would be:
Tool Setup | Trajectory Planner | Threading | Count/Rev - is the RPM Readout correct?
KFLOP Encoder Axis InputGain0 - again that would show the RPM readout would be wrong if that changed
FRO?
Rotate the Spindle One rev manually and check if the Kmotion.exe Axis Screen shows the correct number of Position Count change.
HTH
Regards