I would like to make suggest to check your backpack often. If your backpack get max like 80 or 120, please make sure clean up as you can as often. The best number as you can stay is 50 or low but for 80 try to less than that because of you need gears, wands, pets, decks and mount.
Yesterday (May 22, 2012) my friend lost two seeds out of 9 crown seeds. We suggested to make sure check your backpack and banks. He checked bank as well and found two in bank.
If both are max, please clean up. If both are max as well, if you farming or anywhere to do quests, your items will go poof! Just be careful to make sure check and clean up. Please do clean up often as you can.
I wish you Good Luck with Spiral!