I am missing 3 champions?

So i logged in today and i went into a team builder game to play with Rengar, but then he was locked for some reason and i don't know why. So i went to my champions page in my profile and I saw not only Rengar being locked, but also Gnar and Darius. I also had leaverbuster for some reason and 480 RP on my account? (I had 0 RP the day before this) I had lvl 5 mastery on Rengar and Darius and a lvl 4 mastery on Gnar. Any thoughts or help?