Anivia Wall Bug

Hey all,

So today I was playing jayce, trying him out and doing very poorly. The other team had an anivia, who was quite good, but.... she threw down a wall as i flashed, I messed up the distance, landed on the wall, and was rooted on top of the wall unable to move in any direction. WHAAAAAT? Anyone else flash onto anivia wall and have it root them? Thanks!