My rank doesn't move up even though I win games.

Hello Halo team, I don’t know what is wrong but when I play slayer and I win a game, I see the green arrow pointing up but I don’t get leveled up, the bar still remains the same. This is really messing up my game play. My gamer tag is UNInvited GUe5t. I have won 3 games and I’m still at Plat 5 after losing one game at Plat 6. I keep playing and I don’t get leveled up but the moment I lose a game, I get demoted. Please, do get this fixed for me. I have deleted my profile from the console and downloaded it again but I’m still experiencing the same challenge. This is happening when I play arena slayer. I’m yet to be ranked for other game types.

And also, when I visit the halowaypoint site, my KD is 0.918 but on my console, it’s 0.4. PLEASE, fix this for me

give this a read if you want to understand what is going on.