Why content coming from single?

Here is solution…please try this stuff……

<?php
/**
 * The template for displaying all pages.
 *
 * This is the template that displays all pages by default.
 * Please note that this is the WordPress construct of pages
 * and that other 'pages' on your WordPress site will use a
 * different template.
 *
 * @package WordPress
 * @subpackage Twenty_Twelve
 * @since Twenty Twelve 1.0
 */

get_header(); ?>   

<?php
$post = $wp_query->post;
if ( in_category('11') ) {
    include(TEMPLATEPATH . '/single_our_services.php');
}    
elseif ( in_category('44') ) {
    include(TEMPLATEPATH . '/single_rugged_product.php');
}             
elseif ( in_category('50') ) {
    include(TEMPLATEPATH . '/team_leader.php');
}
elseif ( in_category('50') ) {
    include(TEMPLATEPATH . '/saas_maker.php');
}
?>
<?php //get_sidebar(); ?>
<?php get_footer(); ?>