Anyone know how to fix that?

Has any one an idea how can i fix this? Its the second game this happened. And it hapened at different point of development. When i shoot the shotgun my mp5 sniper and pistol my character makes weird side steps when i shoot on ar and rpg work normaly. I tryed making the animation new blueprint, ported in new animations didnt help checked if my skeletal meshes have collision and no they dont.I even pulled manualy all files back to the latest auto saves and it still didnt work. At this point i am realy frustrated and would not realy try to start from the begining. what is this? - YouTube.