Entityform is spanning the full width of the browser. Well beyond page margins
The problem lies in the somewhat flawed structured and logic of the theme. The best solution to this would have been to restructure the theme and apply the styles for the container class, which handles most of the content layout, to a wrapper in the page.tpl.php template so that all pages get the same layout no matter content.

However, as the theme is as it is, and you don't have much Drupal knowledge I would instead recommend to apply the "container" class to the form element, or wrap the form in a div with that class. Unfortunately you can't do that in the UI.

The fastest and easiest way to fix this is to add the class to the form using hook_form_alter().

In your /sites/all/themes/chesapeake/template.php file, add:

/**
 * Implements hook_form_alter().
 */
function chesapeake_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  if ($form_id == 'volunteer_form_entityform_edit_form') {
    $form['#attributes']['class'][] = 'container';
  }
}


And then clear the cache at Configuration &gt; Development &gt; Performance. That should add the "container" class to the form and display the page correctly.