If you look at the product page of the option:
zevizoproperties.com/index.php?option=co...uct&task=show&cid=14
You will see that you have a twitter plugin which adds HTML and javascript code to the description of the option. HikaShop filters out the HTML but cannot filter out the javascript code. Normally, you should not have that code injected there.
The simplest will be to edit the file "option" of the view "product" via the menu Display->Views and change the line:
$description = $this->escape(strip_tags(JHTML::_('content.prepare',$optionInfo->product_description)));
to:
$description = $this->escape(strip_tags($optionInfo->product_description));
which will forbid the twitter plugin to add its modifications to the description of the option.