I dont know how it starts to happen because I didn't notice it when i started playing but the gun says there is a magazine in the gun and can sometimes shoot but not awlays. The bullets do not always register as doing anything and just clicks on other peoples screen.
I dont know if this is a different problem but we have mostly noticed it when trying to fix this ^ glitch but when aiming and pressing why you do not reload and nothing happens on your screen but on my friends screens I am shooting and the same happens when they do it. When this happens bullets are not being used but if you re join the bullets have been used however many times I have pressed Y.
You cant transfer mag to inventory but you can put the gun in your inventory and not in your hands and take the mag out and then it reloads but the shooting glitch still happens.