Foundation 4 - Topbar SubMenus Menu com show e hide

Fresh install.

I copied/pasted the sample code from the Foundation top-nav docs page.

Added "hide-for-small" class to the ul class="right" and added show-for-small class to the ul class="left" (I'll paste code below)

The menu container height gets busted and incorrectly displays the subnav sliders, cropping their height.

Screens of code without the hide/show

screens of same code with hide/show

<section class="top-bar-section">
<!-- Left Nav Section -->
<ul class="left show-for-small">
  <li class="divider"></li>
  <li class="active"><a href="#">Main Item 1</a></li>
  <li class="divider"></li>
  <li><a href="#">Main Item 2</a></li>
  <li class="divider"></li>
  <li class="has-dropdown"><a href="#">Main Item 3</a>
    <ul class="dropdown">
      <li class="has-dropdown"><a href="#">Dropdown Level 1a</a>
        <ul class="dropdown">
          <li><label>Dropdown Level 2 Label</label></li>
          <li><a href="#">Dropdown Level 2a</a></li>
          <li><a href="#">Dropdown Level 2b</a></li>
          <li class="has-dropdown"><a href="#">Dropdown Level 2c</a>
            <ul class="dropdown">
              <li><label>Dropdown Level 3 Label</label></li>
              <li><a href="#">Dropdown Level 3a</a></li>
              <li><a href="#">Dropdown Level 3b</a></li>
              <li class="divider"></li>
              <li><a href="#">Dropdown Level 3c</a></li>
            </ul>
          </li>
          <li><a href="#">Dropdown Level 2d</a></li>
          <li><a href="#">Dropdown Level 2e</a></li>
          <li><a href="#">Dropdown Level 2f</a></li>
        </ul>
      </li>
      <li><a href="#">Dropdown Level 1b</a></li>
      <li><a href="#">Dropdown Level 1c</a></li>
      <li class="divider"></li>
      <li><a href="#">Dropdown Level 1d</a></li>
      <li><a href="#">Dropdown Level 1e</a></li>
      <li><a href="#">Dropdown Level 1f</a></li>
      <li class="divider"></li>
      <li><a href="#">See all &rarr;</a></li>
    </ul>
  </li>
  <li class="divider"></li>
</ul>

<!-- Right Nav Section -->
<ul class="right hide-for-small">
  <li class="divider hide-for-small"></li>
  <li class="has-dropdown"><a href="#">Main Item 4</a>
    <ul class="dropdown">
      <li><label>Dropdown Level 1 Label</label></li>
      <li class="has-dropdown"><a href="#" class="">Dropdown Level 1a</a>
        <ul class="dropdown">
          <li><a href="#">Dropdown Level 2a</a></li>
          <li><a href="#">Dropdown Level 2b</a></li>
          <li class="has-dropdown"><a href="#">Dropdown Level 2c</a>
            <ul class="dropdown">
              <li><a href="#">Dropdown Level 3a</a></li>
              <li><a href="#">Dropdown Level 3b</a></li>
              <li><a href="#">Dropdown Level 3c</a></li>
            </ul>
          </li>
          <li><a href="#">Dropdown Level 2d</a></li>
          <li><a href="#">Dropdown Level 2e</a></li>
          <li><a href="#">Dropdown Level 2f</a></li>
        </ul>
      </li>
      <li><a href="#">Dropdown Level 1b</a></li>
      <li><a href="#">Dropdown Level 1c</a></li>
      <li class="divider"></li>
      <li><label>Dropdown Level 1 Label</label></li>
      <li><a href="#">Dropdown Level 1d</a></li>
      <li><a href="#">Dropdown Level 1e</a></li>
      <li><a href="#">Dropdown Level 1f</a></li>
      <li class="divider"></li>
      <li><a href="#">See all &rarr;</a></li>
    </ul>
  </li>
</ul>
</section>

fonte : https://github.com/zurb/foundation/issues/2055