Left4Dead2 Visuals Multihack

i was testing forwardtrack and it works a little strange, since at 0ms it works almost perfect, but if you play at 100ms or 200ms it doesnt work and the player just eats the bullets without registering any damage, and i dont know if im sure about this but the backtrack like it affects something having active next to the forwardtrack, l4d2 btw