I've been experiencing this too. My thinking is that it's proccing the initial burst of movement she gets when activating the ability, the one that boosts her into the air, when refreshing. This might be because it's just recasting the ability for free (which would include the boost?) or that the boost is part of the first few seconds of the ability's use time (which would cause this to happen even if the ability isn't being recast and the duration is just refreshed.)
