I lost LR for winning... Saywhatnow?

I lost -5LR for winning a ranked match, coming in 1st and 3rd.
I did kinda ram a dude on the opposite team into a car in street racing unintentionally but I still thought it was funny. Other than that I dont understand this LR system that much and I dont feel that there was a way that I could have avoided losing LR in that race. Can someone explain this sorcery? I’m almost league 6 BTW.