Eris bounty: rapidly kill 10 hive while Radiance is active.
Crucible bounty: kill ## guardians with grenades.
Both cannot be completed while viking funeral and touch of flame perks are selected. the grenades set the enemies on fire and the d.o.t. is credited with the kill, not the grenade (even if you hit them right in the face with it).
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I could see where that would be the case, anything with explosive rounds or damage over time interferes with critical damage kills/perks. Good catch, I don't know if that is working as intended or a bug. You may want to add #bugreport to your post.