Non-existent stairs in my way

When I go to put furniture down it won't let me put it down saying that items cannot intersect stairs but there are no stairs. There were previously placed stairs there but I had moved them to another area in the room but it still wont let me place furniture unless I put it in a separate room and move the room to where I want the furniture, which is less then ideal when I've been moving the staircase around a lot so everywhere apparently has a staircase.