Dreadnova Gangplank Visual Bug [GAMEPLAY]

Idk how to phrase this but I noticed this in my last game,. When you kill a minion or barrel with gangplank's Q with the Dreadnova skin, it leaves part of the animation behind after the unit dies. It was excusable at first but after around 10 minutes it started really bugging me. When you fire Gangplanks Q as dreadnova gangplank its this orange-ish fiery projectile surrounded in a slight blue, and when the unit dies that's left like on the ground, but it is on a layer above the other minions.

It's really hard to explain, because I'm not very knowledgeable with visual terms, I'm sorry if this doesn't make a lot of sense. But the bug is kind of obnoxious and I wanted to bring it to your attention.