Lee sin bug

It's happened in two separate games. I q'd onto wraiths, (3x in one game) and when i recast q, i jumped across the wall, did damage, and then slid back through the wall. Also, on the curvy spot of the wall in jg near the wolves, the spot where you can q to hit the big wolf across the wall, i ward hopped, cleared the wall, and then slid back across. idk what's up with this, but that kind of stuff can't be happening, it could potentially lead to unfair deaths.