Stats are Not TRACKING.

been trying to complete the career paths...noticing that after 200 hours now...still not healed 2000 vehicles health?  really?  still havent killed 15 concussed players?   still havent gotten 50 smoke assists??

anyway i decided i wanted to find the stats for my headshots scrolled down and i noticed it says i have played assault most...20 hours...incorrect...i play support most.   then it says i never play engineer....and im like...is this why i cant complete any challanges???its just not tracking any of them?