Akali's ability

So I started playing with Akali not too long ago. I started with bots and I decided to play blind pvp. But for every games in pvp, Akali's 'W' (twilight shroud) is glitched. It's a visual glitch that makes the smoke, that's supposed to be in a circle, go everywhere. The ability still works and you can activate it, but you don't know where the smoke realy is. Basicaly, in pvp Akali's 'W' is almost useless. Could someone please check this out?