Skarner - Fix this bug!

I just play Skarner in this season. He became my number one main since RIOT ruined my Shen (I hate you) but that's another story. I'm here to talk about a stupid, unbearable and detestable bug! I'm starting to hate this bug since as I climb the ladder games become harder and even the smallest details become important. The bug is about the ultimate.

I R an enemy and I can clearly hear the sound effect of my ultimate and even a graphical effect but in reality I didn't get anyone. Few moments later I usually die or we lose the team fight. Everything says that I impaled an enemy (sound & video) but the ultimate is still there ready to use.

It happened to me also in my last game against a Graves. He was going to kill me but I still had the ultimate to grab him, stop his last AA and bring them to my team mates behind me. It was a safe kill and the best decision but all I got was a sound/video effect and I died with my ultimate still up and ready to use. I started to move around totally sure that he was coming with me but nop, I was walking alone like an idiot.

Now I don't know if this is a bug or if it's working as intended but it is so damn confusing! In a game as a Skarner we already have a lot of things to watch carefully in order to perform our ultimate in the right time on the right target but this is too much. Don't tell me that recognizing fake-ultimates is part of the game.

In conclusion it may seem a very rare bug but it happens very frequently when you play Skarner with a lot of confidence close to its limits and it can cost you a lot (barons, team fights and games).