I do millions of damage on the cbs daily and have been playing for months. My clan has easy through nightmare unlocked. We at least down hard every day. I hit normal, hard, brutal, and nightmare with more than adequate damage according to chests but yet I only received one chest from normal CB and it was the last CB I hit before going to bed. I received nothing else from the other CBS which I did more damage on. What is going on? 

I have an iPhone Xs . OS 12.3.1