You use the trees/forest as a backstop? Can you see as far as the bullets will go? Is there a large hill behind it? That's a known problem in some Glocks, throwing brass in peoples face, on their head, to the left. They aren't supposed to function like that. The factory hasn't been able to fix many of them, aftermarket Apex extractors help some, different gen extractors, as do various (non specific formula) combinations of extractors, ejectors, etc.