beta.inter-club.co.uk (this code is in the wordpress theme index.php)

the homepage is meant to display the latest posts - 3 rows each of 3 posts, in chronological order.

it works fine if I display up to 6 posts. But after that it starts putting the next post in random positions... why is this?

here is the code in question:

<?php
$args = array(
'category_name' => 'blog',
'post_type' => 'post',
'posts_per_page' => 9
//'paged' => ( get_query_var('paged') ? get_query_var('paged') : 1),
);
query_posts($args);
$x = 0;
while (have_posts()) : the_post(); ?>

<?php if(($x == 2) || ($x=="5") || ($x=="8") || ($x=="11")) { ?>
<div class="home_blog_box home_blog_box_last">
<?php } else { ?>
<div class="home_blog_box">
<?php } ?>
"><?php the_post_thumbnail('featured-blog'); ?>
<h3>"><?php the_title(); ?></h3>
</div><!--//home_blog_box-->

<?php $x++; ?>
<?php endwhile; ?>
<?php wp_reset_query(); ?>

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