Is non-registered hits common?

I just played a game where I was ads'ing right at a Pathfinder and spraying him, with 2/15 shots registering and dealing damage. He was standing still like he was frozen (except for firing at me) and didn't take a single hit until he started moving. First time I've seen that happen. Not sure if this was some form of lag, glitch or whatever, but I'm quite sure it wasn't just garbage aim from me. I'm not exactly a great player, but I'm not that bad either.

Has anyone else encountered the same thing at any point?