Mupen64Plus N64 Controller Start button mapped to "home" button

Hi,

I bought some generic usb N64 controllers for my nvidia shield using MupenPlus64.
The problem I have is the "S" or "Start" button is mapped to my home button for the Nvidia shield.
I have tried unmapping but its not really a proper solution, and it didnt work the nvidia controllers didnt do anything when the home button was hit, but the "Start" button
on the N64 Controllers still returns home, so not sure how its mapped or what its actually mapped to.

All the other buttons work...

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