R3 button not working on x360ce

I noticed this while playing DMC Devil May Cry and coulnt get the Devil Trigger to work.
x360ce doesnt recognize the R3 (button 12) from my ps2 usb joystick.
I tested the joystick on windows 10 calibration and all buttons work fine.
I'm sorry if im posting in the wrong category, I've been looking everywhere and even testing older versions to get this fixed.
thanks.