Ranked issues

Okay this isn't about matchmaking or anything but rather how dumb ranked is being. I just entered my series and it gave me one successful win like usual. I play one game and lose it, so now I have 1 win and 1 loss out of 3 games. Yet it tells me my series were unsuccessful and I'm back to 85 LP or 65. What the hell?! Another issue is when I had won a game at 0 LP it said +21 yet I got 15 LP out of it. Make ranked great again.