Black and white graphic bug

Hi everyone.

We are making a FPS game, whenever I shoot, I instantiate a rigidbody bullet with trail.
The problem we are facing is in a particular scene called ACT 1, this graphic bug is happening. All objects go black and sky goes white. This happens when I hold mouse 0 and keep shooting. When I stop, after a second or two everything goes back to normal. I don’t understand why is this happening, it wasn’t a problem before it newly started to occure. Does anyone have any idea?
I have uploaded 2 photos, one where the bug happens and one how it should look.