I just upgraded my former home (3280 Hib) to a guildhouse. I made sure to scoop ALL items in- and outside the house before I did so, I espacially made sure merchant and vaults were in my inventory. Then I upgraded and bought my new personal house at 3286 Hib and replaced my merchant and vaults there.
To my surprise both merchant and vault were empty, which shouldnt happen and didnt happen the last time I scooped them for a house upgrade from 1P to 10P. Thankfully I found the items at the Meath Market NPCs, that normally collect house items after repocession etc. So I painstakingly began moving the items from those NPCs back to my house merchant and vaults.
After only two runs however ALL items disappeared from the NPCs at Meath market and also didnt reappear anywhere else. THEY ARE COMPLETELY GONE.

All of this happened during the last hour.

The content of both merchant and vaults was around 15P in assets, mostly high value crafting material, dragon stones and several drops and MP pieces.

Please help

Items just reappeared, when I checked on them on another toon. This ****** really makes me crazy

EDIT: Oh great now my second toon cant see any items on the NPCs anymore. WTF

EDIT2: Seems to me once you remove an item from the NPCs, the character you removed them with cant see the remaining items any more, even though they are still there.