J4 Bugs [Gameplay]
There is an issue with J4 and his standard. If you place it in front of you when you are near a wall it can pin you there until it disappears, or sometimes if you click in a different direction it will auto path you out. Another issue I have been seeing is champs just walking out of your ult. Most notably there was a Jinx (mafia skin, I do not know if this is relevant or not) that walked out of my ult twice. In the second instance the Jinx could walk out but the Jayce could not.
Hope this is helpful.