Just go inside your house or the store or anywhere really where it will re-load and when you come back out everything will be in it's place again. When it happens to me it's usually Iron Maiden's or whatever that smither is called just inside the gate.
It's always strange when that happens. Warmaiden's has disappeared on me, too. The first time that particular weirdness happened to me was in Morrowind. I was coming down the river path and all of Balmora just disappeared into the sunset. It was very odd.