At first when I died few times on official servers when using shotguns I tought that it was just skill issue, but after that my friend suggested me that crosshair on shotguns is missaligned. Then I went on some deathmatch server and tested it. It turns out that he was right and "real" crosshair is moved to left bottom of the HUD crosshair that we see in the game. I tested it mainly with BK-133, but I tink at least Vaiga is also bugged. I don't know about other BK's or R12 but they're probably missaligned too, because it doesn't seem like a specific shotgun bug. As far as I tested, slugs (green shells) on BK-133 works alright, but I'm not 100% sure. I'm attaching youtube video: https://www.youtube.com/watch?v=na7X0gzncOA