I was in Tier 1 when I picked up some stuff including a Swordstone. I got pretty happy, cleared the floor, went back up to Haven through the elevator, and I didn't have it. I thought everyone on a floor receives materials that one person picks up. Am I wrong? Sorry for being so new.
Nope, loot is distributed to a random party member after each item pickup. It's what gives players incentive to solo (getting all the mats).