Registering a 'completed' Challenge#12 game

I just registered on there, and was awarded 11000 points for retroactive gaming. This challenge you speak of though, I read through the whole thing and wow! one may be able to do it until you get down to number 12! Some of those are insane, congratulations
to those who have completed it, much respect.

The Battlefield 4 I'm loving it! challenge isn't registering any progress either, complete 100 rounds in any game mode, and it ends in a few days.

I,too,have the same problem in Windows 8. I solved it yesterday in 84 moves and like everyone else, it did not register that the challenge was complete. I solved it again today and it's still not registering. Will this be fixed by the end of the month?
It's very frustrating to solve an Expert challenge, only to have it not register as a win.

When you complete a challenge its important that you complete the session. E.g. If you play Spartan Ops and complete a challenge you must finish the mission and dont quit out for it to count towards the achievement. If you quit it still counts on you service
record. Same goes for war games. If you complete a kill challenge you must finish the march. Also during launchdays of Halo 4 completed challenges are known not to register. Just keep playing and it will pop. Ive never heard of someone not unlocking it eventually.

^That usually happens to me with the complete or win a certain amount of games challenges. Like it doesn't fully register that you actually did it until after the game credits are already awarded, it's weird.