F10 binding map vs. custom radio options in comm menu

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So F10 is used to bring up the in-game map.  With the comm menu open, it is also used to access user defined radio options (OTHER).  Because I use this radio function so frequently, I'd like to bind it to a joystick button. So I redefined the map view to SHIFT+F10 and bound F10 to the radio option.  What I can't figure out though is why when I press the joystick button associated with pressing the F10 button on my keyboard, the map comes up (this is after I entered the radio menu).  Does anyone know why this is happening or can anyone suggest a workaround?  I use VR, and the problem persists with voice attack as well.  Thanks!