Apparently the weapon-dropping bit part of the mod. "Realistic Unequip", as pointed to by Kmikaz3 earlier. From the mod description: "The second part of the mod is called Realistic Unequip. It's a realistic form of unequipping that adds to Geared Up or vanilla play. It makes you drop the item in your hand when you unequip/swap it while it's drawn. Your weapons will switch as normal without dropping if you sheathe them first! It's definitely more immersive because when in intense combat you won't sheathe your sword and mace to pull out your bow or staff, you'll drop them and grab the new weapon." After nearly losing three daedric items to this, I will be happily disabling it.
