content aligns underneath sidebar-widgets

Hello everybody,

I’m creating a homepage with different sidebars on different pages. I now have the problem, that on this page the content of the main text-area aligns underneath the content of the sidebar.
It probably is because of my page-template- or sidebar-file, right?
I don’t really know what I did, so I’m a bit lost…
I would really appreciate yopur help!

the code of my sidebar-file:

<?php
/**
 * @package WordPress
 * @subpackage Coraline
 * @since Coraline 1.0
 */
?>
<div id="sidebar-3" class="sidebar-content" role="complementary">
<div id="primary" class="widget-area" role="complementary">
<ul class="xoxo">
<?php
	if ( ! dynamic_sidebar( 'secondary-widget-area' ) ) : ?>

			<li id="nav_menu-3" class="widget-container widget_nav_menu">
				<h3 class="widget-title"><?php _e( 'Unsere Projekte', 'coraline' ); ?></h3>
</li>
<?php endif; // end secondary widget area ?>
</ul>
</div><!-- #primary .widget-area -->
</div>

and this is the template:

<?php
/**
 * Template Name: submenu-page
 * @package WordPress
 * @subpackage Coraline
 * @since Coraline 1.0
 */

get_header(); ?>
<?php get_sidebar('3'); ?>

		<div id="container" class="sidebar-content">
			<div id="content" role="content-box">

			<?php if ( have_posts() ) while ( have_posts() ) : the_post(); ?>

				<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
					<h1 class="entry-title" style="display: none;"><?php the_title(); ?></h1>
					<div class="entry-content">
						<?php the_content(); ?>
						<?php wp_link_pages( array( 'before' => '<div class="page-link">' . __( 'Pages:', 'coraline' ), 'after' => '</div>' ) ); ?>
						<?php edit_post_link( __( 'Edit', 'coraline' ), '<span class="edit-link">', '</span>' ); ?>
					</div><!-- .entry-content -->
				</div><!-- #post-## -->

				<?php if ( comments_open() ) comments_template( '', true ); ?>

			<?php endwhile; ?>

			</div><!-- #content -->
		</div><!-- #content-container -->

<?php get_footer(); ?>