Glad to hear that it seems to be working for you now. When it comes to new items updating the quantity this is usually controlled by the item ID and the option that you choose in the add to cart server behavior. In the server behavior in bindings you have the section for 'if item in cart'. This is normally where you would control that behavior. I'm not sure if what you were experiencing was just a one off glitch of some kind but this is how you make those adjustments just for reference.