[Twenty Twelve] Archive only showing current month

Hi there,

I’m using the Twenty Twelve archive widget to display the archives for my site. I have it in the footer of the site.

For some reason whenever I view a different month, say July 2013, it only shows me the current month (August 2013) blog entries. Why is that?

Here is the code that I have in archive.php –

<?php
/*
Template Name: Archives
*/
?>
<?php get_header(); ?>

<!-- the page title -->
<header class="entry-header">
		<h1 class="entry-title"><?php the_title(); ?></h1>
</header>
<section id="primary" class="site-content">
		<div id="content" role="main">
<div class="posts_list">
<!-- Quary the leatest 50 posts -->
<?php query_posts('post_type=post&posts_per_page=50'); ?>
<?php if ( have_posts() ) : ?>
			<?php /* Start the Loop */ ?>
			<?php while ( have_posts() ) : the_post(); ?>
                        <h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
			<?php endwhile; ?>
	<?php endif; ?>
<?php wp_reset_query(); ?>
</div><!-- .posts_list -->

<!-- Show the categories -->
<div class="categories_list">
        <?php wp_list_categories(); ?>
</div><!-- .categories_list -->

<!-- Show the Monthly archive -->
<div class="monthly_archive">
         <?php wp_get_archives('type=monthly'); ?>
</div><!-- .monthly_archive -->

</div><!-- #content -->
	</section><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

Any help greatly appreciated!

Here is the link to the site