[Client] Looked at a friends profile and then had his masteries in champ select

I looked at a friends profile to check what the name of the League in gold and recent games he played. 5 minutes later when we qued together to play a game I had his masteries in champ select, by this I mean it had both the names and all of his mastery pages (which were less pages than I had). I was able to get around this by opening edit mastery pages and then it switched to my masteries, but this could've gone horribly if I did not realize this as soon as we got into game and would not have had not time to try and edit the pages. I have not tried this again, and not sure if I can replicate the issue.