That's a great question! At checkout, you have two choices: 'Home Delivery' (which has a fee) or 'Click & Collect' (which is free). If you selected 'Click & Collect,' your order will be sent to the store you chose, *not* your home address.
Your home address is simply saved in your account as your main billing/invoice address for all your future shopping, but it's the 'Click & Collect' option that tells us to send this *specific* order to a store.