Page content displayed twice after WP update

Hi updated wordpress on a custom theme and pages content is now displayed twice.

here is the template php

<?php
/**
 * Template Name: Une page 'domaine'
 *
 * @package WordPress
 * @subpackage Starkers
 * @since Starkers 3.0
 */

get_header(); ?>

<script type="text/javascript">

  var inTrans = false;

  $(window).load(function() {
    var $block = $('.blue_block');
    var $doc = $(document);

    var resize2 = function() {
      $block.css('height', $doc.height() - 250);
    };

    $(window).resize(resize2);

    resize2();
  });
</script>

<!--[if IE]>
<style>
  #side_bar {
    behavior: url(<?php echo bloginfo('template_url') ?>/pie/PIE.php);
    zoom: 1;
  }

  #side_bar section {
    behavior: url(<?php echo bloginfo('template_url') ?>/pie/PIE.php);
    zoom: 1;
  }
</style>

<![endif]-->

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

  <article class="grid_7 alpha blue_block practice">
    <div class="content">
      <?php if (function_exists('dimox_breadcrumbs')) dimox_breadcrumbs(); ?>
      <h3><?php echo the_title() ?></h3>

      <?php the_content(); ?>

      <ul class="subpages">
        <?php
          query_posts(array('post_parent' => $post->ID, 'post_type' => 'page', 'orderby' => 'menu_order', 'order' => 'ASC'));
          while (have_posts()) : the_post();
        ?>
          <li>
            <div class="thumbnail"><a href="<?php echo post_permalink() ?>" class=""><?php if ( has_post_thumbnail() ) { the_post_thumbnail("thumbnail"); } ?></a></div>
            <div class="content">
              <h5><a href="<?php echo post_permalink() ?>" class="">&raquo; <?php echo the_title() ?></a></h5>
            </div>
          </li>
        <?php endwhile; wp_reset_query(); ?>
      </ul>

      <div class="clear">&nbsp;</div>
    </div>
  </article>
  <?php endwhile; ?>

  <?php get_sidebar(); ?>

<?php get_footer(); ?>

anybody as an idea how to solve this issue?

Thanks