CH USB Yoke propeller axis problem; only have partial range

I recently bought a CH Products USB Yoke, and it's a very nice, precision
yoke. However, I noticed that I don't have the full range of the propeller
axis when comparing to the throttle quadrant in an aircraft.

First, I have configured the yoke precisely with control manager 3.6 and all
controls have their full range according to the program. When I fly the
beechcraft baron, throttle and mixture utilize their full ranges, but the
propeller axis range on the yoke reflects from 25-75% range. Is this normal?
Why does this happen? When this happens, I can use the mouse to push the
prop further forward and back.

I have Windows XP Professional and am using MS Simulator 2004.

Mike