Hi,
The link to the product page in the cart is generated dynamically. But the module doesn't know the real link to the product page.
To solve that, the simplest is to fill the "canonical URL" field of each product with the product page URL of the product.
That way, the links on the cart will use that link automatically instead of trying to guess it.
Also, if you set the "force canonical URLs on listing" setting of the HikaShop configuration to generate the canonical URLs, they will be filled automatically for you when you display the listing of products.