Hi,
If you're using that template, you normally deactivate the styles of HikaShop and only use the styles of the template.
It's the template we would recommend as we're using it on our own demo website and as you can see there, it works fine.
But most of the templates listed in the "templates for hikashop" menu of our website, or bootstrap2 templates should work just fine without using styles.
Styles should actually be used when the template isn't made for HikaShop and you want to made HikaShop's look closer to the template.