Hi,
This looks like a problem with the layout override of the product page by your Joomla template.
Try switching to the default template of Joomla and it should display fine.
And try renaming the folder templates/YOUR_TEMPLATE/html/com_hikashop/product/ via FTP to deactivate all the overrides of the product view in your template, and it should display fine for your template.
So then, try renaming the files one by one in that folder to identify which one is causing the problem.
If the layout is fine with you with that file override deactivated, then that's it, otherwise, you'll have to contact your template provider for help.