The dashicons are not loaded for non-loggedin users. You are using an arrow-up icon from the dashicons, on the right-side of the website. So people can click that icon to go to the top of the page.

I now manually need to add the following to the functions.php file:

/**
 * Load dashicons for non-loggedin users
 */
function ww_load_dashicons(){
    wp_enqueue_style('dashicons');
}
add_action('wp_enqueue_scripts', 'ww_load_dashicons');

The page I need help with: [log in to see the link]