Help Center answers
Why does my eBay shipping addresses page show duplicate shipping addresses?
If your PayPal account has been linked to your eBay shipping information, you may have some duplicate shipping addresses. To fix this, click the "Delete" button underneath one of the duplicate addresses from your eBay shipping addresses page. This will not delete the address altogether, it will simply delete the duplicate.
If the duplicate address is from your PayPal account, you can go to your PayPal account Profile and remove the address from the My personal info section.