All posts show no matter which one chosen

I’ve messed something up in my theme so that when I try to chose one post to view, all are chosen. Limiting the posts displayed to only one (query=1) doesn’t solve the problem as only the top post will display no matter which one is chosen. My website is: https://www.fullscalearchitecture.com/press. The poorly written index code is below:

<?php get_header(); ?>
<div id="wrap">

<?php include(TEMPLATEPATH."/left.php");?>

<?php get_sidebar(); ?>

<div id="content">
	<?php if (have_posts()) :?>
		<?php $postCount=0; ?>
		<?php while (have_posts()) : the_post();?>
			<?php $postCount++;?>
            <?php if (get_post_meta($post->ID, 'header image', true)) { ?>
           <img src="<?php echo get_post_meta($post->ID, 'header image', true); ?>" />
 <?php } else { ?>
 <?php } ?>
<?php if (is_home()) { ?>
           <h2 class="entrytitle"><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
           <h3 class="entrydate"><?php the_time('F jS, Y') ?>, By <?php the_author() ?></h3>
 <?php } elseif (is_single()) { ?>
 <h2 class="entrytitle"><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
           <h3 class="entrydate"><?php the_time('F jS, Y') ?>, By <?php the_author() ?></h3>
 <?php } elseif (is_page('about')) { ?>

 <?php } else { ?>
			<h2 class="entrytitle"><?php the_title(); ?></h2>
 <?php } ?>

<?php the_content('Read More &raquo;'); ?>

	<?php endwhile; ?>
	<div class="navigation">
	<div class="nextposts"><?php next_posts_link('[OLDER]') ?></div>
	<div class="previousposts"><?php previous_posts_link('[NEWER]') ?></div>
		</div>

	<?php else : ?>
<div class="not_found">
		Not found. Sorry but we don't see any items with that subject.

</div>
	<?php endif; ?>
</div>

<?php include(TEMPLATEPATH."/right.php");?>

<?php get_footer(); ?>