Poison mist can appear in a location other than where you cast it. One way to make it happen is to jump down and hit the ground while holding the poison mist button. But it's not limited to jump down. You can make it happen by jumping off a rope or platform. It seems that when you cast poison mist, the server asks "where is that player's location?" which is sometimes out of date. Ideally, casting poison mist should send some sort of location update information first, then poll the player's location. You can avoid this delay by walking any amount when you hit the ground. Therefore, I usually take a small step when I hit the ground before I mist. Poison mist is still totally usable, but I just figured that it should be reported. Also, fellow F/Ps might benefit from knowing how to work around it.
