For others who are curious, that was indeed the block. It created some sort of redundancy. I removed the following chunk:
// Add the blog name.
bloginfo( 'name' );
// Add the blog description for the home/front page.
$site_description = get_bloginfo( 'description', 'display' );
if ( $site_description && ( is_home() || is_front_page() ) )
echo " | $site_description";
// Add a page number if necessary:
if ( $paged >= 2 || $page >= 2 )
echo ' | ' . sprintf( __( 'Page %s', 'spun' ), max( $paged, $page ) );
...then saved the header.php file and uploaded it to my child theme and the duplication in tabs is gone!
Still can't figure out how to eliminate hovering text when mousing-over the circles, however...