Hi,
You have some javascript errors in your page ; that's why the tabs are not working (and displayed) correctly.
And your current error is with a script which try to initialize "chosen".
So you can deactivate the setting "Use Chosen library" and hope that you won't have other issue with a jquery module:
www.hikashop.com/support/support/documen...html#display_general
Or you can fix your website in order to not force the inclusion of jquery at the end of the header ; because it destroy the jquery library loaded by joomla and all of his modules (like chosen)
<script src="/media/jui/js/jquery.min.js" type="text/javascript"></script>
<script src="/media/jui/js/jquery-noconflict.js" type="text/javascript"></script>
<script src="/media/jui/js/jquery-migrate.min.js" type="text/javascript"></script>
<script src="/media/jui/js/chosen.jquery.min.js" type="text/javascript"></script>
<script src="/plugins/system/rokbox/assets/js/rokbox.js" type="text/javascript"></script>
<script src="/templates/rt_myriad/js/chart.js" type="text/javascript"></script>
<script src="/libraries/gantry/js/gantry-totop.js" type="text/javascript"></script>
<script src="/libraries/gantry/js/browser-engines.js" type="text/javascript"></script>
<script src="/templates/rt_myriad/js/rokmediaqueries.js" type="text/javascript"></script>
<script src="/modules/mod_roknavmenu/themes/default/js/rokmediaqueries.js" type="text/javascript"></script>
<script src="/modules/mod_roknavmenu/themes/default/js/sidemenu.js" type="text/javascript"></script>
<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
<script src="/modules/mod_jpanel/assets/js/jpanel.min.js" type="text/javascript"></script>
HikaShop have some securities to not loose jQuery and the modules ; but that's not the same for Joomla or other extensions/plugins.
When you have a javascript error, the javascript processing is stopped so a lot of things might not be initialized or could not work properly.
Regards,