Hi,
One of your products in the carousel module on your frontpage has the URL:
http://leconcepts.com/component/hikashop/yamaha-rx-a2060-aventage-9-2-black-receiver
If I look at the HTML of that page, I don't see any canonical tag in the header of the page.
When a product has a canonical URL, HikaShop will add the canonical tag to the header of the product page, regardless of how HikaShop is configured. So either you don't have a canonical URL set in that product, or you have customized the product page to remove the code which adds the canonical URL to the header at the top of the file "show" of the view "product":
if(!empty($this->canonical)) {
$doc = JFactory::getDocument();
$doc->addCustomTag('<link rel="canonical" href="'.hikashop_cleanURL($this->canonical).'" />');
}