Wrong PTS for defeats and wins

Hi! I have a weird thing in ranked matchmaking. When I win, I usually get between 0 and 10 PTS. But for defeat I lose something about 30 and 70 PTS. I don't know how it's happened. To earn 30-40 PTS I need to win like 10 games in a row (at least 10). How to play this matchmaking? I have a strong opinion this is a bug