Shooting from prone position often leads to shots hitting the ground. I assume the shots and the ground colliders conflict in some way. In fact right now it is mostly impossible to take shot from prone position to the target unless you don't climb on a rock before or shoot down a slope. This needs fixing so much, especially this is the only way to reduce the sway/wobble to an almoat acceptable level.
Otherwise the aim wobble should be reduced drastically, as it is not realistic in any way.