I personally have only experienced this only once or twice, but it seems that a lot of other people are also getting SO MANY DARN CRESTS OF ALPHA LUPI out of exotic chest engrams. Because of this, I'm wondering if its some sort of bug that has occured that is causing this frustration. There is probably some reason for it that is perfectly acceptable and I'm too stupid to figure it out, but as of right now I think its a glitch/bug. Lets get this to bungie, people!