masteries are bugged

I played a ranked game of maokai top, so i had my runes and masteries set for a tanky top build.

Then I played an ARAM with my friends. I was twitch. So i switched my masteries to my adc page.

Then i played a another ranked game and went maokai top again. My mastery page in champion select said "maokai top" because of the ranked game i played before that ARAM.

Then when i got in game, I still had the adc masteries from the ARAM.

So basically, I don't feel like double checking my mastery page is ACTUALLY what it's supposed to be every game instead of just trusting the labels on my mastery pages like I've been doing for the past 4 years.

TLDR: playing an ARAM prior to a 5v5 game uses the masteries you just used in the ARAM, but displays the masteries from the last 5v5 game played.