My portfolio page is only displaying 6 out of the 10 posts

<?php
  get_header();
?>


<section class="row">
  <div class="small-12 columns text-center">
    <div class="leader">
    <?php if(have_posts()) : while(have_posts()) : the_post(); ?>
        <h1><?php the_title(); ?></h1>
        <h6>By: <?php the_author(); ?></h6>
        <p><?php the_content(); ?></p>
    <?php endwhile; else : ?>
        <p><?php _e('Sorry, no pages found.'); ?></p>
    <?php endif; ?>
    </div>
  </div>
</section>



<?php
  get_footer();
?>

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

<section class="row">
  <div class="small-12 columns text-center">
    <div class="leader">
    <?php if(have_posts()) : while(have_posts()) : the_post(); ?>
        <h1><?php the_title(); ?></h1>
        <?php the_content(); ?>
    <?php endwhile; endif; ?>
    </div>
  </div>
</section>
<?php
  $args = array(
    'post_type' => 'my_portfolio'
  );
  $query = new WP_Query($args);
?>
<section class="row no-max pad">
  <?php  if($query->have_posts()) : while($query->have_posts()) : $query->the_post(); ?>
    <div class="small-6 medium-4 large-3 columns grid-item">
      <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('large'); ?></a>
    </div>
  <?php endwhile; endif; wp_reset_postdata(); ?>
</section>
<?php
  //loads footer.php
  get_footer();
?>

<?php

add_theme_support('menus');
add_theme_support('post-thumbnails');


function register_theme_menus(){
  register_nav_menus(
    array(
      'primary-menu' => __('Primary Menu')
    )
  );
}

add_action('init', 'register_theme_menus');

function wpt_theme_styles(){

  wp_enqueue_style('foundation_css', get_template_directory_uri() . '/css/foundation.css' );
  //wp_enqueue_style('normalize_css', get_template_directory_uri() . '/css/normalize.css' );

  wp_enqueue_style('google_font', 'http://fonts.googleapis.com/css?family=Asap:400,700,400italic,700italic' );
  wp_enqueue_style('main_css', get_template_directory_uri() . '/style.css');
}

add_action( 'wp_enqueue_scripts', 'wpt_theme_styles');

function wpt_theme_js(){
  wp_enqueue_script('modernizr_js', get_template_directory_uri() . '/js/modernizr.js', '', '', false);
  wp_enqueue_script('foundation_js', get_template_directory_uri() . '/js/foundation.min.js', array('jquery'), '', true);
  wp_enqueue_script('main_js', get_template_directory_uri() . '/js/app.js', array('jquery', 'foundation_js'), '', true);
}
add_action('wp_enqueue_scripts', 'wpt_theme_js');

?>