Placing one ammo box places two at same spot

When placing ammo box two appear at the same spot overlapping each other (both can be seen in image during gray building phase). I can manage to build one if I look away from the spot, but if I keep looking at it then both of them get built. This didn’t seem to happen to other build objects. 2 boxes appearing does not happen everytime and I don’t know what causes it to happen.