Feeding my Halo addiction
Just to be sure are you sure you used a blue XP boost and not a jackpot? The jackpots award a more random amount so it could be be slight chance you got a big jackpot on the game that ended in round two.
Made your first hot drop into HaloWaypoint.com
Halo 5: Guardians MP Beta
Halo 5: Guardians MP Beta participant.
View your Service Record on the web.
Become a member of an active Spartan Company.
Halo Legendary Crate Subscriber
Awarded to subscribers of the Halo Legendary Crate