Twice now I have completed challenges (the monthly one this month = 30,000XP and the two daily challenges today = 10,500 total) and turned off my xbox, the next time i play i am missing the exact amount of xp from the challenges. The first time I had leveled up two levels and equipped the newly unlocked armor, the next time i played i was back at my pre challenge level and the armor had re-locked. Others have also experienced this issue. Very annoying as the challenge still shows as being complete. Please fix this bug.