domination challenge 4 coldfront / heatwave skin

So sometimes i start the game and challenge 4 of domination shows its not completed, even tho the ticks are present. And other times it will show completed. But in both cases my skin is not unlocked in nato/recon for it, being coldfront and heatwave. 
I can start a match and it will show on the top left that the challenge has just been unlocked again, but still no skin unlocked....