I have a bug that has given me 7 gilded undermine crest short of what I should have. Basically You get 7 gilded undermine crest for each delve above 8 I think and 10 for completing the bounty map so last week I got 31 while this week I only received 24 while my friend did the exact same as me got 31 this week.
The game has marked me down to using all my gilded quotas but Instead of getting 3 gilded chests this week I only got 2.