Masteries/Runes (rage thread)

I recently had some games where i got my Masteries/runes mixed up, and i thought to myself: Ok, it happens, i probably didn't pay attention in the pre-game lobby.

But then i had a game with Olaf jungle. (yes, that champ still exists.)

A game where i started with 27 ap for some unknown reason. I checked my masteries and runes before the game, and i set them to:

Basic Bruiser: Flat ad, Flat mr, Flat Armor

And life recovery ad: which is a 13/17/0 mastery page including ad of course.

And for some reason, i started the game WITH 27 AP.

As an olaf.

As a jungle olaf.

What. The. Heck.

And yes, i lost the game.

Please Riot, explain this to me.