The category in gears of war 4 not work

It’s not fair that I win 20 games and only go up 10% and when lose a single games i lose 20% I’ve been playing and winning all week and my index does not move. But lose a single game and they lower me. It’s not fair. I want to get to diamon and that’s not how you can

It becomes a bit of a logjam at Onyx and above. The people that play at those rankings win, and are expected to win most of their matches. Rounds are also important.