A...Yorick? Bug?

So I recently played an Aram with a Yorick. At the end of the game he had an impossible amount of damage dealt and taken. I think that the way Riot tracks that may be a bit off when Yorick is involved... I've included the graph for Damage Dealt, Damage Taken, and the scores of each champ and the time to show they should not have been able to get that much damage without it being an error in how Riot records the data. Imgur Album Here