Tags are only displaying one (the most recent) post

Whenever I visit a tag, my theme is only displaying one post rather than looping through several.

My tag.php looks like this:

<?php get_header(); ?>
<div id="blog-content">
<h1 class="page-title"><?php _e( 'Tag Archives:', 'blankslate' ) ?> <span><?php single_tag_title() ?></span></h1>
<?php
get_template_part( 'nav', 'above' );
$count = 0;
while ( have_posts() ){
        the_post();
        get_template_part( 'entry' );
}
get_template_part( 'nav', 'below' );
?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

My entry.php looks like:

<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<div id="blog-content">
<h5 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( __('Read %s', 'blankslate'), the_title_attribute('echo=0') ); ?>" rel="bookmark"><?php the_title(); ?></a></h5>
<?php get_template_part( 'entry', 'meta' ); ?>
<?php
if(is_archive() || is_search()){
get_template_part('entry','summary');
} else {
get_template_part('entry','content');
}
?>
<?php
if ( is_single() ) {
get_template_part( 'entry-footer', 'single' );
} else {
get_template_part( 'entry-footer' );
}
?>
</div>

Anyone see anything wrong with what I’m doing? This is built off of the blankslate theme.