Hi,
1. That's something you should check with your template provider as the product page layout is customized by the template.
I guess, you could add such CSS to remove the bottom description:
.product-details-bottom{ display:none;}
www.hikashop.com/support/documentation/1...ize-the-display.html
2. There is some custom javascript code added there which has an error. Apparently, this comes from a view override of your Joomla template. The best would be to check on that problem with your template provider.
What you can try is rename the file templates/YOUR_TEMPLATE/html/com_hikashop/product/show_block_img.php via FTP in order to disable the view override on the image area and that might help but you might loose some of the styling added by the template.