Your setting seems OK.
- Check the step size in the USG program, maybe it is not set to jog 1 mm
- Check if the position as shown in the USG program changes 1 mm when you jog 1 mm.
- Execute the next line in the UGS command window, your machine should jog Axis X, 1 mm at 10 mm/min
G21G91X1F10
Please report the results