Missing challenge progression

Since I reached the level to start processing through the challenges thats been my aim to unlock the extra content but my progression hasn't always been registering. For example for engineer having to repair vehicles, was doing that and the progress bar wasn't going up even though I was repairing my tank and squad mates tanks even other players on my team and nothing and then in other games it would slowly trickle up. I've achieved it now but it took a long time. I'm not doing the assault rifle challenge and having to get kills over 50m with an AR and I've done that alot but it only shows 20 kills when I know I got more then that in the last game I played. This needs to be fixed