No Masteries Selected After New Patch

I have 20 Mastery pages set up, yet somehow I've been in 2/3 games since the last patch where I've had 0/0/0 masteries. Even if the wrong page had been selected I still should've had SOME masteries but instead I had no keystone and Lolnexus showed 0/0/0. I've checked and all 20 of my potential pages are spent, so it's not selecting a random empty page.
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