Weapon Challenge Rewards not Unlocking

Yesterday, after they changed some of the challenge requirements to make them easier, I played a game, and it said that I had unlocked/completed about 3 or 4 weapon challenges that I had been working on. However, when I went to the loadout screen to equip them, it said they were still locked. But when I go to the challenge, it says it's completed. I've tried restarting my game a couple of times, verified the integrity of the game files twice, and played at least 10 matches since, but nothing has changed. I'm playing on Steam, so I'm not sure if this is platform-specific or not.