Do you mean that you are now watching the car from behind or that you are looking rearwards (as in the opposite direction of what you are driving)?
If it's the latter then check the "look back" binding in keybinds, it might be bound to something which is continually pressed etc.
Resolved, I looked in the steering wheel settings and it had put some wrong commands in the rear view thing. Thank you for pointing me in the right direction.