YankeeJim:I'm not sure it's the scroll function that's doing it but my wireless mouse will occasionally change a club or scale when just moving it without touching the wheel.
My old mouse was getting a bit worn out, scroll wheel and left click button. It wouldn't take that much movement to scroll the wheel a notch forward or back.
The mouse i use at work can get stuck between two notches on the mouse wheel and when I go to move the mouse it will finally settle into place. I tried to set it like that on purpose while playing at work ( shhhhhhhhh) ;-) just to find that a club change or putter scale will happen if i bump it.