8BitDo N64 controller mapping issues

[ApplePiTart]

I'm having some issues where my N64 Bluetooth controller (8bitdo modkit) allows me to map certain buttons in the controller profile, but they don't register in games themselves. These are:

• Z trigger -> mapped as Z trigger
• Star and Heart buttons on the rumblepack/charging block -> Mapped as back and menu Mupen functions

Any ideas? The buttons are physically working as I can map them, but they have no effect when a game is running.