That didn't happened to me..
I decorate my house, and leave, the next time i go inside the items are on the floor, THEN, i put them in place again, and leave, when i eneter again, they stand still on the places i put them..
Just do like me: Drop the items on the floor, leave the house a few times, 2 times are enough, then enter again, place everything where you want, and VOYLA.