Support Specialist 2 challenge 3

I got the airburst incendiary grenade launcher unlocked and have been trying to complete the challenge for deal 2000 damage. I’ve been using it religiously and only gotten 24/2000 damage, I have hit and ignighted so many people and no progress. If there a bug with the challenge or any way to fix it so it’ll progress? Or is this a issue EA is going to have to go in and fix?