I believe this has to do with turret steer/zoom as i got weird lag issues after the implemention of said systems. A possibility would be to turn these off for a limited time to see how these impact the server
Edit; to all you who doubt me, if im right, server lag would indeed be affecting and worsening this bug.
Turret steer/zoom screws with the player side of the controls, but is turned on off by the server itself. This is why i suspect it being the culprint, it make the server increase its traffic, thus more that can go wrong