Hi,
I don't see why the ajax input would be linked to the prices display.
Try changing temporarily your Joomla template to the default one and see if you still have the problem on the product page.
If you do, then the problem doesn't come from the view overrides and we would need more information like a link to the product page, a screenshot of the settings of the product, of the settings of your HikaShop configuration.
If you don't, then the problem comes from the overrides. In that case, the simplest is to rename the folder templates/YOUR_TEMPLATE/html/com_hikashop/product via FTP and that should remove the issue with your template.