Joystick controls -reversed- on a PC?

I've configured the 3 joystick controllers on my Logitech Rumblepad 2 for my sim and have configured them in the input manager so they work properly on my iMac. I just tried running a Windows build (first time) and noticed that although the primary joystick functions properly, the other two (joystick #2 and the tophat) do not. Their vertical inputs are backwards, in other words, up is down and visa versa. Did I miss something or perhas this is a bug?