the last patch in feb

I don't know what the heck happened but right after the patch or update whatever you guys call it, i been having problems in zombie mode, stupid bugs and it happens most of the freaking time, the monster is like far away from me like 2 or 3 meters away but it can still hit me, how is that possible?did crossfire added some kind of elasticity to their arms and claws? that is really not cool, the monster is away from me and it clearly is not supposed to hit me but it does anyway, i didn't have this problem until they made the update or patch whatever saying "BUG FIXES" when is more like BUGS ADDED!!! IS NOT MY COMPUTER CUZ I HAVE NO VIRUS AND MY PC IS RUNNING THE SAME WAY AS IT USED TO, my internet is really fast and my pin in the game is 42, i don't know if is a good pin, so no problems with my pc or the internet my guess is that it must be the patch or something, any1 else getting this problems?

any help?