Hi,
I'm not sure. It could come from a customization of a view file. Temporarily switch to the default template of Joomla and see if you have the issue without saving once. If not, then it must be linked to a customization in a view override in the folder templates/YOUR_TEMPLATE/html/com_hikashop/product/
If you still have it, we would need a backend and a FTP access in order to check the situation on the website to be able to say. You can provide these via our contact form:
www.hikashop.com/support/contact-us.html