Ranked balancing isn't working?

I have been playing some halo swat and I am a plat 4 and for some reason I am getting placed against onyx and diamonds and I am the only plat? My search preference is in balanced as well. I can sometimes beat the onyx and diamond and I always seem to be at the top of the my teams table and I have diamonds on my team. Please could you tell me what is happening, thanks.

Hey OP. If you link up some of your games and post them in the latest Matchmaking Feedback topic, then Dr. Menke or some members of the community can help to give you a bit of insight into what was happening with the matchmaker / why you were being matched with players of those ranks
https://www.halowaypoint.com/en-us/forums/58b8518e005f432381ab99fbcaf931e0/topics/matchmaking-feedback-update-%e2%80%93-august-31/bd0d524a-aeb1-432c-aa33-68e854a5125e/posts