go to waypoint and look up your service record.
If you notice the guy whose job it is to import the system that keeps track of how many and what medals you get in matchmaking just completely forgot all the killing spree medals lol.
He also forgot about all the legendary medals like extermination and perfection… lol.
Guess he has only played halo 1 and thought the only medals that existed were multikill medals… either way this is ridiculous, keeping track of my medals and 2.1 k/d is like the only reason I still play reach.