Why is views output HTLM each row nested like this?

See it at http://wce.hddigitalworks.com/classes

It's a view of Style: unformatted, Row stye: Node, use all built-in templates

The HTML markup output is like this:

<row 1>
  <row 2>
    <row 3>
      <row 4>
      </row 4>
    </row 3>
  </row 2>
</row 1>

all the rows are nested. I would expect it to be:

<row 1>
</row 1>
<row 2>
</row 2>
<row 3>
</row 3>
<row 4>
</row 4>

?

Here is the view:

$view = new view;
$view->name = 'classes';
$view->description = 'List of all classes';
$view->tag = '';
$view->view_php = '';
$view->base_table = 'node';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('fields', array(
  'title' => array(
    'label' => '',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'link_to_node' => 1,
    'exclude' => 0,
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
    'relationship' => 'none',
  ),
  'body' => array(
    'label' => '',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'exclude' => 0,
    'id' => 'body',
    'table' => 'node_revisions',
    'field' => 'body',
    'relationship' => 'none',
  ),
));
$handler->override_option('filters', array(
  'status_extra' => array(
    'operator' => '=',
    'value' => '',
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'status_extra',
    'table' => 'node',
    'field' => 'status_extra',
    'relationship' => 'none',
  ),
  'type' => array(
    'operator' => 'in',
    'value' => array(
      'class' => 'class',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'type',
    'table' => 'node',
    'field' => 'type',
    'relationship' => 'none',
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
));
$handler->override_option('cache', array(
  'type' => 'time',
  'results_lifespan' => '3600',
  'output_lifespan' => '3600',
));
$handler->override_option('title', 'Classes');
$handler->override_option('header', '<p>Class size may vary according to age, type of class, and the discretion of the instructor. The student coach ratio will not exceed 8:1 for any given class.</p>

<p>The schedule, coaches, and fees are subject to change.  All classes may require 4 gymnasts to be enrolled to remain scheduled.</p>

<hr />
');
$handler->override_option('header_format', '2');
$handler->override_option('header_empty', 0);
$handler->override_option('use_pager', '1');
$handler->override_option('row_plugin', 'node');
$handler->override_option('row_options', array(
  'relationship' => 'none',
  'build_mode' => 'full',
  'links' => 1,
  'comments' => 0,
));
$handler = $view->new_display('page', 'Page', 'page_1');
$handler->override_option('path', 'classes/list');
$handler->override_option('menu', array(
  'type' => 'default tab',
  'title' => 'List',
  'description' => 'Class list',
  'weight' => '0',
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'normal',
  'title' => 'List',
  'description' => 'List of classess',
  'weight' => '0',
));