Metaboxes are empty

I encounter a weird bug with my custom meta boxes.

Every other custom-field (using more-fields and more-types plugins) below my meta-box are empty when editing a page.

Ive checked everything and it seems that metadata isnt gone, everything still shows up correctly in front-end as well in DB, but in backend it seems that my meta-box is disrupting loading of everything else.

I have 9 custom fields in 4 containers when i drag-n-drop my metabox into first position, all other boxes below are empty while editing and if update button is hitted, well data is lost.

can ANYONE see what am i missing out in my code ?
quick idea is that i use custom post type where i have entire crew-team. but for each other custom post type i need to add someone in the crew as contact-person. but this contact dropdown screws everything else up ??

OK – Here is my metabox at the end and all works
Error – Here is my metabox above some other boxes and those end up empty

add_action('admin_menu', 'add_contact_as_list', 16);
	add_action('save_post', 'contactlist_save_handler');

	function add_contact_as_list() {
		if ( function_exists('add_meta_box') ) {
			/*add_meta_box(
				'myplugin_sectionid',
				__( 'Kontaktlista', 'myplugin_textdomain' ),
				'myplugin_inner_custom_box',
				'post'
			);*/
			add_meta_box(
				'myplugin_sectionid',
				__( 'Kontaktlista', 'myplugin_textdomain' ),
				'myplugin_inner_custom_box',
				'page'
			);
		}
	}

	function myplugin_inner_custom_box() {

		$editPostID = $_REQUEST['post'];
		//wp_nonce_field( plugin_basename(__FILE__), 'myplugin_noncename' );

		$args = array(
			'post_type' => array( 'Medarbetare' ),
			'orderby' => 'rand'
		);

        query_posts( $args );

		echo '<p><label for="contactlist_selected_person_id">';
		  	 _e("V?lj kontakt vars info ska publiceras", 'myplugin_textdomain' );
		echo '</label> </p>';
		$var;

		$my_meta = get_post_custom($editPostID);
		$selectedID = $my_meta['contactlist_selected_person_id'][0];
		$sel = 0;
		echo '<p><select id="contactlist_selected_person_id" name="contactlist_selected_person_id" >';
			while ( have_posts() ) : the_post();
				$id = get_the_ID();
				if($selectedID == $id){
					echo '<option value="'.$id.'" SELECTED >'.get_post($id)->post_title.'</option>';
					$sel = 1;
				}else{
					echo '<option value="'.$id.'" >'.get_post($id)->post_title.'</option>';
				}
			endwhile;
			if($sel == 0){
				echo '<option value="Ingen" SELECTED>Ingen</option>';
			}else{
				echo '<option value="Ingen">Ingen</option>';
			}
		echo '</select></p>';
		wp_reset_query();
	}

	function contactlist_save_handler( $post_id ) {

		  if ( !wp_verify_nonce( $_POST['myplugin_noncename'], plugin_basename(__FILE__) ) )
			  return $post_id;

		  if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
			  return $post_id;

		  if ( 'page' == $_POST['post_type'] )
		  {
			if ( !current_user_can( 'edit_page', $post_id ) )
				return $post_id;
		  }
		  else
		  {
			if ( !current_user_can( 'edit_post', $post_id ) )
				return $post_id;
		  }

		  $mydata = $_POST['contactlist_selected_person_id'];

		add_post_meta($post_id, 'contactlist_selected_person_id', $mydata, true) or update_post_meta($post_id, 'contactlist_selected_person_id', $mydata);
		return $mydata;
	}