This is either caused by server lag, some random bulletproof doodad, some quirky mechanic of the game, and/or a combination of both. I'm quite disappointed with the quality produced in gameplay design. The graphic detail, even without DX11, is lovely. Everything else is pretty horrible.
Second thing I really hate is running out into the open begging to be shot while trying to collect dog tags for my kill streak. It's bad enough that I can barely kill the guy unless I sneak up on him, now I have to run to his corpse before his teammates figure out where I am and grab the dog tag. I mean, only a suicidal sadist would shoot a guy then expose himself to the open just so he can grab a memorabilia off the corpse, and then proceed to teabag it. I'm not that kind of guy and damn it don't force me to be one.