Stats are not recorded anymore

It’s been 5 days since my stats are not registered on Halowaypoint. Whatever playlist i’m playing on Halo MCC, it does not show on my online profile. Worse, when i play Halo 3 ranked last night I went from level 20 to 25, restarted my game and I was back level 20 … Uninstall and install the game didn’t work.
My friends don’t have this issue, their game works fine.

If someone can help me, it would be appreciated. Thanks !

(Sorry for my English from France ^^)