LOST 40 LP FOR A CRASH

So i played a rank game with my friend Macer200, the game was about 30 minutes long. We ended up losing that game, but right after i pressed "continue" at the Defeat screen, the game crashed. It said "repairing client" or something along those lines. Ive fixed the client by setting my date 1 day back, and my time 1 hour back. I then proceeded to log in and play ranked with my friend and saw that i had lost about 40 LP. i think we should have lost 20 but definetly not 40. Someone please tell me a fix and whats going on.

Thanks