Assault 2 and Support Specialist 3 challenges not tracking

I am having issues with Assault 2: Get 15 kills or assists on concussed enemies and Support Specialist 3: Deal 2,000 damage with SICH G1 WP as Support challenges not tracking. Only 7 of my kills on concussed enemies have counted, despite having killed enough to finish the challenge and only 40 points of damage using the Incendiary Airburst rifle have counted, despite having used it to inflict damage on and kill numerous players. I am playing via Steam.