Error that gave me no masteries in-game?

So I wanted to add a 16th mastery page for Jax Jungle. I did this during the select-pick phase , however when I was done I suddenly got the message there was an error , please try again later. I hselected my jungle olaf mastery page instead and went with Olaf. However during loading I noticed something odd: My masteries were missing. Well... That kinda sucks. In the pick-ban phase I did select the right mastery page , it just turned out in the game I didn't had any after getting that error message. With no masteries I mean no masteries at all. All my mastery pages are fully filled and I did select the right mastery page (even checked twice). It's not the new Jax mastery page I made , since that one was fully filled aswell and I had the olaf jungle mastery page (also fully filled) selected. I don't know how but I still ended the game 6/3/20 and still won but it'd be really annoying to get no masteries when you're in lane and you'll just get trashed by your opponent with masteries (if he's not way worse than you).