[Gameplay] Graves Autos on Dragon and Baron

Graves autoing dragon or baron caused the shotgun blast to visually bug out, for some reason. It happened to both ours and the enemy graves, while we were taking dragon, I don't know if they were taking baron at the time, but it seems a likely reason, as we later found them attacking baron which was at around 1/2 hp. The shotgun blast bugged out there too. I'm not sure how to link a picture. I have one though. This didn't happen the first few times we took dragon or baron, but later on it was stuck like that. It did not bug out on champions. Did I do the etiquette thing right?