Masteries not changing

So I was in playing a ranked game in the new dynamic queue and I picked Hecarim, my runes and masteries, and all seemed well. But then once we were in game it decided to give me my AP carry mastery page (with deathfire touch) instead of my top hecarim page (with thunderlords), which was not all that nice. As you can imagine deathfire touch isn't fantastic on Hecarim. Our team lost, it obviously wasn't just because of my wrong masteries and I'm not going to ask for a loss prevented but I thought i would report the bug :)

A mate checked lolking in game and it also showed that i should had hecarim top page and i didn't change to the page last minute either. Notably the normal game prier to the ranked i did use that AP carry page.

Ps these are cool! [slayer-pantheon-thumbs]