Funny thing is I've never had this issue with Fallout 3 or Fallout: New Vegas, but it happens so often in Skyrim I gave up...
Morrowind was actually really easy to decorate. All my houses there were full of collections and such.
Oblivion was a lot harder, but you could still do it and things generally stayed put.
Skyrim ... all but impossible really. The drop, leave re-enter and drag thing works, but it really should not be that hard to decorate one's home.