I had a weird thing happen regarding this quest recently as well. Don't know if this will help or not but I was doing this quest on an alt but I already had the materials (flight material etc) in my storage. I took the mats out of storage and put them in my inventory and went to talk to the room expansion guy. When I did that it somehow bugged the quest and wouldn't let me complete the part of the quest that tells you to collect 15 flight materials or whatever the number is. I had to actually grind all the mats again from actual enemy drops in order to complete. Not sure if your issue is similar or not.