I'm guessing not a bug. Just about everything you craft in Heavensward takes a lot more ingredients than older recipes; consumables and lures add to the fun by making you craft multiple times for the same yield. Don't get me wrong; most crafters would HAPPILY use three times the ingredients if it meant they could make three potions at once, but I still don't think it's a bug. SE wants crafters working three times as hard when producing these consumables.

In the case of Lures, to be fair, getting three was generally a waste, since fish hardly ever snapped your line and made off with your lure (with a few exceptions involving certain fish and certain lures - hello, Gigant Clam!).