Axes from different joysticks mixing

I am using BeamNG Drive on Arch Linux. First of all, the game won't launch through steam, which seems reasonable because it might be attempting to use a windows executable. Instead, I have to manually go to the steam folder each time and execute the right binary under BinLinux. Is there a way I can automate this?

Okay, now for the real issue: I have a joystick and pedals from a flight simulator, but the pedals have a switch to make them available for driving. However, when I set up the keybindings, I assign the XAXIS of the joystick to steering and the XAXIS as well of the pedals to the brake. For some reason, these are detected as the same axis. While assigning the binding, the game seems to differentiate correctly between devices because I can see "joystick0" and "joystick1". How do I get this fixed? Before posting random command outputs, please tell me what logs would be useful.

By the way, they also appear as different hardware devices, with the correct names assigned, in the Hardware tab.