It has been a little while since this has happened to me and people might already be aware of this but ill post it anyways. I was trying to sell a rare on Danae but i picked my "0" in my inventory instead of the rare and it sold my "0". I then just had a blank slot in my inventory with no "0". I went to my clan WK and "accidentally" deposited my blank inventory spot into my clan. At the time I had 25-30 level 8's and right when i clicked add to clan or whatever, they all dissappeared. My "0" then came back to my inventory. My money was still there but all the rares were gone. So i did what everyone does when something happens and re-logged. They were still all gone. So like an idiot, once i found another rare (archi wand i think), i went back to my clan and tried depositing it. The wand disappeared as soon as i added it. I then went and bought some stupid little item from the store and tried again, it also dissappeared like i thought it would. So now i am stuck with an item eating clan...but i do have my "0" back so i guess thats one positive i got from it
