Yep, It happens. There is what they call a flip-flop valve that makes the thing steer like what we expect when we put it in reverse. The thing works on pilot pressure from the reverse clutch pack. When not in reverse, the pilot line dumps any leakage from the steering valves into the transmission. Service manual says to replace valve when leakage becomes excessive. Not sure what excessive is, as they're kinda vague on that point. I just removed the one on the 75, hooked the steering lines together and capped the pilot line. Now turning the wheel right (or left) always results in the front of the tractor going right (or left) -- doesn't matter if you're in forward, neutral, or reverse. As I remember, the new valve was kinda spendy and really no guarantees that it wouldn't have leakage either. Whether it would be deemed to be excessive, is another question.

Take the seat out and remove the floor panel that's under the seat. If I remember correctly, it's fastened to the back of the steering valve atop the transmission. Four half inch hoses and one small one that comes off the transmission. Here's a pic of the one I removed from my 75: