Just an FYI. I got a nice bunch of Fire Elemental cells from the Barbael dungeon (2 floors completed). It was a big factor for me in deciding to do the dungeons now rather than wait (I need Fire cells).
Logged out, when I logged back in, the Fire cells I got from the Barbael dungeon had vanished.
Sent a ticket to support. Meanwhile, suggest keeping an eye out for this glitch.
EDIT: I think, without being 100% sure, that I lost exactly 100 Fire cells. It may be that, somehow, when I crafted Barbael it cost 100 Fire cells. If anyone else crafts him, please check your Fire cells before and after, and report if it happens to you too?