You may have noticed that your RP is now 1500. No, your little brother didn't steal your account and lose a lot (again) it is because it's a new set. Just as ranking is weekly, RP is by Set. So, there is a Set1 RP list, a Set 2 one, etc. Don't worry, your RP will be preserved under the Rankings button... just as soon as Monday rolls around and we all get into the office.
"Scissors are overpowered. Rock is fine." -Paper