Tristana E Bug in ARAM

Riot, I was playing an ARAM yesterday and whenever I used 's E on one of the turrets, instead of it showing a bomb by the top of it like it normally does, it was not there and all I saw was a red glow near the base of the turret. I am not sure why this happened, but it was every time, not just once. It was only a visual bug, and the damage still went through properly, but I figured it should be brought up either way.