The challenges for PKP PECHENEG and M60E4 Mastery are registering incorrectly in Elite. On my page I see 88% completed on these two challenges, while they are finished in game. The other LMGs mastery challenges register correctly.
I have a lot of challenges(Black Ops 2) that have still status 0% in Elite. For example, Mk8 Qualified is shown as unfinished with 0% although I have mastered this weapon already and challenges like Mk8 Longshot and Mk8 Bloodthirsty are shown as DONE.