Same thing happened to me, after using the same button i use clearing out my inventory for hours and opening chests and getting on the sparrow and literally everything else in the game that doesn't involve shooting, I auto pilot deleted my exotic engram. No, it does not take 5 seconds to delete these, it takes less time in fact to delete than a piece of armor or weapon. It'd be nice if they're going to create a game that imitates MMOs with a budget of $500mil to at least have a help ticket you can put in to resolve game issues. I'm assuming this forum has no official ties to bungie help, just general Q&A?