I had the problem that my weapons didn't do any damage. First time was with a LAR, second time with a Mlock. Both times I played on experimental Server.

The first time I was attacked by wolves. I shot the whole magazine, but the wolves wouldn't die. Just logging out fixed the problem. When I logged in again, there was ammunition in the magazine again, even though I shot my whole magazine.

Second time happened with a pistol. Shot the whole magazine again. Only log-out helped. When I logged in again there was ammunition in the magazine again and my pistol was jammed. Strangely, I had used the pistol a couple minutes before. It worked fine until it stopped working.

I'm just surprised it happened twice in such a short time on experimental server (DE3536). Yesterday 13.09 and today 14.09. Maybe you changed something that increased the frequency of the bug?