[GAMEPLAY] Sejuani stun disappearing on rift scuttler.

In all 3 games I've played as Sejuani tonight, when farming the rift scuttler on 3 seperate occasions my 4 stacks of frost were removed/the stun 'cancels' when the scuttler came in contact with the bottom wall entrance to the dragon pit.

Basically I would auto attack to apply the 4th stack, the scuttler would impact the wall, and either the four stacks disappear when it hits the wall, or they disappear when it hits the wall AS I cast the stun. Each time it was in relatively the same spot, left wall of the dragon pit if you're a champ looking into it, or the bottom part of the outer wall in the river, not in the pit.