Rank only goes down

I’m on a 7 win streak in doubles, starting at diamond 2 90% to diamond 3. I’ve played against people with higher ranks (diamond 4-6) while my buddy is platinum 5. I don’t get any progress after a win, but my friend does. When we finally lost a game after 8 matches, i lost over 25%.

After this i was pretty salty, so we decided to play slayer. Exactly the same issue here, played 2 games, won both, nothing happens.
And YES we played against people near our rank or even higher ranked so i’m 100% sure thats not the issue.
I also hard resetted my xbox twice.

Please fix this

Please read through the thread pinned at the top of this section and leave any feedback there.

Thanks.