Insane damage dealt to champions stat Yorick post-game screen [VISUAL BUG?]

So we had a 18:54 minute game of ARAM, we won not leaving a single piece of Yorik left on the Abyss. In post game screen we checked the stats of damage dealt and to our suprise Yorik had 531831 damage dealt[1] (in 19 minutes, while losing, horribly). I find that quite hard to believe since me as Aurelion Sol, most fed of the game, leading everyone (except yorik) in damage with 34589 dmg dealt (which is already quite alot in 19min). So I assume this is a visual bug that has to be dealt with some time, nothing game breaking just wanted to let you know about it.

[1] Link with screenshot added showing champions and numbers on dmg dealt statistic.