Your ranked system is broken!!!

Games Halo 5: Guardians
1

Me and my mate just won 8 games in a row and none of us went up even a bit. He was diamond 1 I was high platinum 3. We lost ONCE and both got de ranked. I should be plat 4 and he should easy be diamond 2. Explain yourselves

2

For questions about the ranking system or other aspects of matchmaking, please see this thread.