I'm going to try this. If you take out the Shooting part you here inside the plane . you will here the bulitts hiting the ground. I'm going to try taking that sound out and puting back in the gun sound. That may be over lapping in the cfg some how.

I will let you know if this works.

I know that people like YOYO and Ianp are not having this happen to them.
I don't know what syestm thy have.