Losing LP after winning game?

So after loading into a Ranked game my house completely lost power. After about 5-8 minutes my power came back on and i loaded right into the game. Thankfully, my team held my turret the entire time. At level 1 facing level 7's i ended up catching up, getting first turret and we won the game. I finished with a 4.25 KDA. In comparison to my lane opponent I: -Out-Damaged -Out-Visioned -Out-CSed -Out-Gold Earned(?)

Everything. And instead of gaining my rightfully deserved LP. I LOST 19 LP.

I maybe understand receiving less or nothing at all, but LOSING a full amount? This has to be fixed.