Weekly Challenge - Light Machine Gun

Hi, I am level 110 on the battle pass this season and have completed the majority of the weekly and daily challenges, but the following challenges do not register for me:

Week 2 - 20 knocks light machine gun

Week 6 - deal 5000 damage with a light machine gun

I have over 200 kills this season and one of my most used guns are light machine guns. So I am certain it is a bug. Everything else seems to work fine except for those 2 challenges. 

Thanks!