Something about Jarvan IV's ult

Hello Riot!

                        So I have been playing with a party to gain the bonus ip. I saved a lot of ip and bought Jarvan IV, so i tried him out (practicing in bots). I noticed that there is a 10% chance of the AI bots escaping my ult just by walking right through it, not flashing/not by skill(abilities) but just walking right through it. Unfortunately i am not blessed with a recorder to record what happen but i think you have the technology to watch what happen in the bot game. it happened twice for me. I hope it is just the AI just bugging out because it would really suck if the j4 ult is the one having a problem and it  happen to  a real game. 

Thank you for reading and sorry for wasting your time.