Hi,
1. It must come from the "layout on product page" setting of the HikaShop configuration that you set to "reversed" instead of "default" in the HikaShop configuration.
2. Does it work with the default layout ? Does it work with the default template of Joomla ?
Did you modify some code of some views of HikaShop for the product page via the menu Display>Views ?
3. You'll have to add custom code in the file "show_block_img" via the menu Display>Views. The code is not just one or two lines. It will require a developer to work on that for a bit.