Is anyone having the same? so I logged in today and played a firefight game and then this happend:
Yes it seems to be a problem, there is an active thread in support at the moment:
https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/commendations-wiped-clean/af439e71-84ba-4622-ad4c-65952e0ce863/posts