Hi,
Please look at the view "product | show" where you should find the lines
$this->setLayout($this->productlayout);
echo $this->loadTemplate();
to load the product layout view.
It might be possible that the template override that view and force the product layout to "show_default" for example.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.