So as title says i just encountered a bug with said engram: at the time of buying it i had 2 missing exotic armor pieces for my warlock(and I opened it with a warlock btw) which were Felwinter's helm and Promethium spur, which both say 'Source: Exotic Engrams;extremely rare world drop', so i was hoping to get one those, but instead i got a second sanguine alchemy and i just don't get why. Should i contact support?