Malphite ultimate still not unstoppable.

I remember some patch notes like 2-3 months ago saying that Malphite ulti and Jarvan ulti weren't as unstoppable as they should. But like 2 months ago after the patch I remember playing Malphite and getting my ulti stopped by Ahri charm in the middle of a wall which made my ulti firstly get denied completely and some moon walking out of unwalkable terrain. So I got pissed off about this cause I thought Malphite ulti was already patched as unstoppable but wasn't I even recreated the situation on howling abyss without any terrain this time and got my ulti getting still canceled midway. Or well.. the ulti isn't completely denied but when the charm hits you get charmed and your ulti will knock up every under you when you get charmed and not where you ulti in the first place so Ahri charm just makes the malphite ulti not go as far as planned which still screws him over really badly. So can you look into this and fix it, even though I haven't touched our rock solid friend for a good while.