Hey Kamarad,
Hope all is well in your life
Buddy, I'd like to remind you, I live in Australia, I play with usually around 300ping, lately I have been playing on a WIFI connection so it's been even worse, mostly between 350-400 and every now and then it even jumps up to 900 and drops back down after a good minute or so. Ok, why do I mention this? Because that is what you are seeing my friend, it's the lag, you are seeing me shooting an earlier version of the zombie, so when you see me shooting beside the zombies in the demo, and my shots are still hitting them, that's because on my screen they're still at the spot I'm shooting at and haven't yet moved to where you're seeing them, you feel me? I hope this makes sense to you coz it's an important point.
Also, I would like to draw your attention to the fact that so many of my bullets were missing them, take a closer look at that demo, for a second time, pay special attention to the bullet holes, they're all over the place.
I get you're trying to do the right thing here bro, hackers deserve no mercy, I'm with ya, however, you haven't quite hit the nail on the head with this one, I am no hacker.