Random *Free* RP?

Hi, Im Bob Norris, and when I logged into League today, I had noticed that Elementalist Lux had released and I wanted to look at her in the store. To my surprise, I had over 5k RP, when the night before all I had was around 200.

The link above shows my RP purchase history and the last time i had bought anything was in September. And I know that RP Gifting has been blocked for some time now, so Im not sure how I got this extra RP.

Admittedly, I immediately bought the Lux skin in the excitement, but I dont want some strange repercussions due to a bug...seeing as how i i cant afford the skin in the first place.

I probably should write support for help, but I wanted to see if anyone else has run into this, "issue" first.