FPS game my aim is completly broken and i dont know why it kind of complicated

I am using the unity FPS Controller and it looks up and down side to side just fine but when i attach the gun model to it it will not look up and down just side to side. But I have gotten it to work before (look up and down) but after saving the scene and project whenever i come back to it it breaks and does not work i have no idea whats wrong I think the script works fine is it the way I’m setting it up?

More info

I have the Gun model attached to First Person Character

I was able to solve the problem a camera was interfering with the FPS Character camera