A Thieves Guild item marker (0009CEA6) in House Gray-Mane is clipping into the back of a shelf (and maybe very slightly into the bottom). I'm not sure if it's related, but the Ornate Drinking Horn was missing in my game (
screenshot). There's a possibly this was a fluke because I reloaded a previous save and it was there. Maybe you can tell if the marker placement is off enough to warrant an adjustment.