Bug Jarvan IV

Hi, i was playing in the Twisted Treeline with 2 other friends, i was with Jarvan IV and my auto attacks didn't proc the Jarvan's passive, in fact my damage was the same on the first, second and all the auto attacks i made on a champion or minion. The auto attack animation is also bugged because sometimes me and my friends saw the damage but not the animation. I have tried in custom Summoner's Rift and it's and also in Custom Twisted Treeline and it's working, so i don0t know if this is a isolated bug.
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