Caldarius legendary gear bug

So i completed all of caldarius lore challenges, but i finished the last two in the same story mission. The challenge page for him says i have only completed 4/5 but his lore page is fully complete, and i know i finished them all. I never got his legendary gear. Please fix this bug in the next update as i worked really hard for this and it is discouraging me from completing lore for other characters.

Same thing happened with Rath for me.