I've checked on several servers, on several computers. Every single time it was a dead soldier that was causing the artifacting. Not once was it barbed wire. This is an issue with the dead soldiers.
I just went and had a look at what was causing it. To my surprise the epicenter of all the artifacting was a corpse of a military zombie (One of those that are pre-spawned on the floor). This was the case at the airfield in Balota as well as the deer stands there. Both times the cause of the artifacting was a pre-spawned military corpse.