Comments not showing for post

I’m working on my first proper WP site and I’ve run in to a odd problem.

I’ve created a custom post type and also a custom page template for said type. On the page I’m showing the latest published post and also wish to show the comments for it.

custom post type name: listening.

In my file that registers my custom type I have support for comments added.

register_post_type( 'listening', array(.....
   'supports' => array( 'title', 'editor', 'comments', 'revisions', 'sticky')

I aslo have in my page the following code:

$args = array( 'posts_per_page' => 1, 'post_status' => 'publish', 'post_type' => 'listening' );
query_posts($args);
.....
        <?php while (have_posts()) : the_post(); ?>
          <article id="post-<?php the_ID(); ?>" role="article">
            <header class="article-header">
              <h2 class="post-title">
                <?php the_title(); ?>
              </h2>
            </header> <!-- end article header -->
            <section class="entry-content">
              <?php the_content(); ?>
            </section> <!-- end article section -->
            <?php comments_template(); ?>
          </article> <!-- end article -->
        <?php endwhile; ?>

In the admin interface comments are activated on the post as well.

I can’t understand why the comments are not show. Any help is greatly apprechiated.