I have a camera problem

I started a new project using the Third-Person blueprint. I was trying to make a Horror Game so i Needed a First person camera. I added the camera to the caracter mesh, enabled Use controller rotation yaw and Use pawn control rotation.
Firstly all was good, but now when i am moving the mouse left or right my character is making a big circle and that is making my character to move forward an back.

Can you help me?

Hard to tell from just a description, have you seen this?: