I picked up 3 exotic engrams from the Postmaster. Two dropped exotic armor pieces, the other one dropped the Unflinching Fusion Rifle Aim mod and nothing else. Is this normal? Because if not, I would like an exotic arms armor piece because it was a serious pain to grind those lost sectors just to get cheated out of the Exotic I was looking for.
Yes, it is normal: when you have no more free slots for Engrams in your Inventory, some items (like Enhancement Cores and mods) will go to the Postmaster looking like Exotic Engrams but they never were