Lets say that your enemy goes back to avoid your overhead, and then he decides to come front to attack, for some reason, if your weapon is near the ground (thus near the enemys feet) the game registers a successful leg hit , and in rare occassions a torso/head hit.
In the next days I`ll try to record this, and provide a video of the bug, but I`m most certain that other polearmers have noticed this bug.