Oriana's ball not showing up on champions

you can see that in the whole second half of my 2/8 ori game, my ball wasn't showing up on champions, it was actually unplayable not knowing if my ball snapped back to me so i could ult or if it was still on someone else. it first happened when i E'ed my ezreal as he died, and the ball become invisible as it got to him, and it stay that way for the rest of the game