People over the past week or so have noticed that stuff they farmed on their ranch is gone later.
Cause: Looting stuff from the farm, and then zoning, disconnecting, or logging off, causes the items to disappear.
Fix: Currently being worked on by dev team
Workaround 1) Mail your items to an alt, or put them in your bank, to 'lock' them to you. Performing some kind of action on the items (I don't think simply moving from one bag to another works) seems to flag them for cosistency.
Workaround 2) If you are already missing items, or forget to 'do something' with them and disappear, you can ticket GM's and they will restore it for you. Annoying, but it works. Your items are not missing (even though it seems that way)
Behind the Scenes: Players have a sort of "ghost" inventory. It's often used for GM use, and certain situations of item overflow. You cannot see, nor access it, but GM's and developers can. The items are falling into that inventory and not being removed properly. They're working on a fix. I don't know if the fix will inherently restore the currently missing items or not, or if GMs will still need to dig through a million accounts to move items in the proper place afterwards >.>