Gamepad input issue

On PC, using Xbox 1 wireless controller.

The controller will make inputs as if it were mouse and keyboard. Seemingly using both, gamepad and M&KB, at the same time.

I adjusted the “Mouse sensitivity” and it affected my controller sensitivity.
“a” is bound to jump, but every time I press “a” the text chat opens.
“b” is bound to crouch, but every time I press “b” it jumps.
Occasionally the Left Joystick will show the Mouse Arrow.
I cannot cycle through any menu items/ select screens.

Thank you for your help