Single.php showing all posts?

For some reason my page single.php is showing all the post from a category instead of just a single post! I cannot figure out why this is at all. Am I missing some code?

<?php get_header(); ?>
<div id="container">
<?php if(have_posts()) : ?>
<?php while(have_posts()) : the_post(); ?>
<h2><?php the_title(); ?></h2>
<?php the_content(); ?>
<?php endwhile; ?>
<?php endif; ?>
</div>
<?php get_footer(); ?>

The post in question: http://easingslider.matthewruddy.com/screenshots.

I want it to display the screenshots post but instead it is displaying all the posts from that category. Really would appreciate if anyone could help me fix this.. Thanks.