Issues with keybinds

Hey,

not sure if it also affects PC users, but on Xbox Series X with keyboard and mouse I am having a weird issue with my keybind. 

I have B set for chopper to exit the vehicle, but since I also have it set up for changing fire mode whenever I leave the chopper my gun is in single fire mode. 
I know I could change the keybinds but it should not work like this  

Anyone else with this issue?