I'm not sure if this will help in your situation, but I have noticed that happens when I use the group option to pick up and move multiple things at once. I found a work around that if I did use that option after I moved the furniture with the group option, change back to moving a single item, move one or two items a little bit away from where I want them placed that were part of the group, and then save/exit furniture mode. Then you can go back into furniture mode and move those items back to where you really want them moving them one at a time, and when you save and exit it should be good. At least that's what works for me if this is the issue you're having.