Got to 50 SR then reset to 49 SR

I was playing Halo 4 War Games and got the monthly challenge when I was 49 SR and only needed 12800XP to rank up and got 17343 plus 5416(double XP), I got to 50 SR and enlisted in Specializations and then was reset to 49 SR and now can’t get XP and it has not said “You have reached your online XP limit” yet can anyone help me out?

Not the exact thing but something similar happened to me. I had just won the final game to get the monthly challenge, had double xp on, and only ended up getting 9k total. Then got to the lobby and it then said I hit the cap. So I missed out on at least 10k of xp. Wonder if the monthly challenge xp isn’t registering on our profiles?