Halo 5 ranking only goes down

I started the day at low diamond 4 and have gone 14-8 and am now diamond 3 my rank decreases after loses. This is very frustrating I’m not claiming my rank should be much higher then it was when I started to the day but having my wins not count towards anything is unacceptable. Does anyone know what the problem is?

Have a read over the OP
https://www.halowaypoint.com/en-us/forums/58b8518e005f432381ab99fbcaf931e0/topics/matchmaking-feedback-update-%E2%80%93-may-21/7d3f6e81-5f9e-44f7-b5cf-30f85d13f320/posts