I think that I may know the reason behind all of this.... It may b, because u might be curing ur flowers too fast. When u cure/dry ur flowers too fast it doesn't have time to break down the chlorophyll, and trace elements like magnese, calcium, iron, etc. So what u have in the end result is non palletable product that burns, smokes, tastes, smells, like poopy. This is because these impurities got left behind.
Better Luck Next Time.