Well the good news is I have a pretty good idea of what is causing the furniture resetting. If this happens to you often(or you can reliably reproduce it) I would love to check it out with you so I can debug it. I know what's wrong, but I don't know why it's doing it and I can't make it happen myself.
The ghost furniture is just from furniture that shows additional images. It only happens when you're moving furniture(at least for me) and should update as soon as it's moved.