Inventory and chest items vanishing after lossing out.

I placed items into some chests, logged out, and upon logging back in later, nearly all of my recently placed chests were empty, as was my inventory (including equipped items). I went from 16 full chests (actually 8 large chests) of items to 4 (2 large chests) full with the others still in the exact same spot, just empty. It was not a multiplayer map/server.