Off-Canvas Menu: Problems with multilevel menu - zurb-foundation

Question

I´ve implemented the Foundation Off-Canvas Menu as a Multilevel Menu. When I use the original code example from the documentation, I´ve the problem, that the submenu isn´t working. It´s shown but it´s not formated (sub-levels not hidden) and the click event to open the submenu is also not triggered.
To me it looks like some parts are not compiled although I compile the whole foundation framework, not only specific modules.
Has anybody an idea where I can start searching? The other parts of the menu work great.
Here´s the HTML code:
<aside class="left-off-canvas-menu" aria-hidden="true">
<ul class="off-canvas-list">
<li><label>Navigationsmenü</label></li>
<li><i class="fa fa-shopping-cart"></i> Mein Warenkorb</li>
<li><i class="fa fa-arrow-right"></i> Zur Kasse</li>
<li><label>Mein Konto</label></li>
<li class="my-account">
<div class="avatar">
<img src="<?php echo "http://www.gravatar.com/avatar/" . md5( strtolower( trim( 'mail#mail.com' ) ) ) . "?s=100";?>" class="avatar" alt="Avatar" />
</div>
<div class="user">
<span class="title">John Doe</span>
<span class="email">email#email.com</span>
</div>
<div class="clearfix"></div>
<i class="fa fa-user"></i> Meine Daten ändern
</li>
<li><i class="fa fa-home"></i> Adressbuch bearbeiten</li>
<li><i class="fa fa-truck"></i> Meine Bestellungen</li>
<li><i class="fa fa-lock"></i> Passwort ändern</li>
<li><i class="fa fa-envelope"></i> E-Mail Adresse ändern</li>
<li><i class="fa fa-power-off"></i> Ausloggen</li>
<li><label>Produktkategorien</label></li>
<li class="has-submenu">Aktionen
<ul class="left-submenu">
<li class="back">Zurück</li>
<li><label>Level 1</label></li>
<li>Sonderangebote der Woche</li>
<li>Monatsaktionen</li>
<li>Spezialaktionen
<li>Maximal sparen</li>
</ul>
</li>
<li>Gutscheine</li>
<li class="has-submenu">Ernährung
<ul class="left-submenu">
<li class="back">Zurück</li>
<li><label>Level 1</label></li>
<li>Nahrungsergänzungsmittel</li>
<li>Vitamine & Mineralstoffe</li>
<li>Spezialnahrung
<li>Gesund abnehmen</li>
<li>Sportlernahrung</li>
</ul>
</li>
</ul>
</aside>
And that´s the SCSS file (app.scss):
#import "compass/css3/border-radius";
#import "compass/css3/box-shadow";
#import "settings";
#import "foundation";
Thanks,
Michael