wrong number of excerpts

hello again,
i use this code on my frontpage template to display 6 page excerpts. it is showing only 3??! as i don’t know much php – did i do something wrong? or could that simply be a styling problem?

<?php
  $args=array(
  'orderby' =>'ID',
  'order' =>'asc',
  'post_type' =>'page',
  'post__in' => array(35,32,26,148,172,38),
   );
   $page_query = new WP_Query($args); ?>
 <ul class="section">
<?php while ($page_query->have_posts()) : $page_query->the_post(); ?>

    <li id="ID<?php the_ID();?>" class="introbox"><h2><a href="<?php the_permalink();?>"><?php the_title();?></a></h2>
    <?php the_excerpt(); ?>
       <!--  <p class="readmore"><a href="<?php the_permalink();?>">zum Inhalt</a></p>
    <span class="perm"><a href="<?php the_permalink();?>">Permalink</a></span> -->
    </li>
<?php endwhile; ?>

thanks!