Due to session cookies, when you log in to a website, it will remember that you are logged in. This is so that you will not have to re-enter your password every time you visit the site. If you are still logged into your .org account on Donorbox and then visit your organizations website, the 'admin control: dashboard edit' will be visible to you and your donors. Once you have logged out of your Donorbox .org account, this line will no longer be visible on your website.