Sidebars Appending the Number "1" after widgets

Maybe you guys can help me out with this. I created a simple version of a plugin I’m working on to add widget-sidebars dynamically via shortcode. I created a very simple version of what I’m talking about so I could post code for you to look at:

add_shortcode('Test', 'cs_test_shortcode');
function cs_test_shortcode(){

	return dynamic_sidebar('cs-test-sidebar');
}
add_action( 'widgets_init', 'cs_test_init_widgets' );
function cs_test_init_widgets(){
	$args = array(
	'name'          => 'cs-test-sidebar',
	'id'            => 'cs-test-sidebar',
	'description'   => '',
        'class'         => '',
	'before_widget' => '
<li>',
	'after_widget'  => '</li>
',
	'before_title'  => '<h2 class="widgettitle">',
	'after_title'   => '</h2>' );

	register_sidebar($args);
}

Which works beautifully, I put the shortcode in a post and the widgets I have defined in the section show, but for some reason every section has the number “1” appended. It isn’t enclosed in tags or anything.