AP Leblanc Gets "Largest Crit Strike" at End of Match?

So, when playing my Leblanc mid, I noticed at the end of the game I had the biggest crit? I built only ap items, and NO, I didn't build crit items mid game. It was all ap. Is this some bugged passive glitch? Does her passive technically count as a crit now? That's the only thing I could think of, as my autos certainly didn't do 800 damage (see image for reference). Anyone know what's going on?