Random Gun Glitch?

K so I was in game and I alt tabbed to go get a water. The game kicked me to the game lobby and when I rejoined this is what my gun did and everyone else gun when I spectated them. This happen with the awm as well when it cliped in so instead of little golden things as clips poping out guns did I will provide 3 screen shots. http://postimage.org/image/mpwpbgoxn/