Hi,
There is nothing strange here. The URL is calculated dynamically based on the current menu item (that's how Joomla's SEF system works).
Since you're on a different menu item on the search results page, the system has to generate a different URL.
However, note that HikaShop has a "canonical URL" setting in each product.
In that setting, you can enter the main URL /da/shop-da/pins/223-golf
Then, if you activate the "Force canonical URL on listings" setting of the HikaShop configuration, HikaShop will use that canonical URL on the different pages instead of generating a URL via Joomla's SET system.
That way, you'll get the same URL everywhere.