Robin what's hard to understand in what was said? the shape of your vehicle mod is different from the original vehicle, while Luke used the original vehicle he obviously saw your body parts like head and shot at it, and even though he hit you, you lost no health. Why? because you use a modified vehicle which is a bit higher than the original, so on your screen, you were fully behind it. And since the client (you) update the health for your character once a bullet hits you - you got no health loss as the bullet never reached you in your screen. So as Devin said, better get rid of it.