Using Multiple FPS Controllers Locally

Hey guys, I'm working on a local multiplayer fps game and I'm having some issues. I know that I need to set the inputs for the controller in project settings > input. When I do that, I have an issue where the buttons control the correct character, but play sound clips for both and when one character walks, it shakes the screen of the other as if the non-moving player is stepping.

Where do I go to fix these existing issues?

UPDATE:

This appears to happen when I turn off or delete the camera linked to one of the players. Is there a way I can make both players see the same screen?

Caused by headbob. I'm not sure why I only get it when I turn a camera off though