Hi,
This indicates that you've activated the "floating tax prices" setting in the HikaShop configuration.
When you do that, you have only the input field where you enter the final price of the product for everyone, regardless of the tax they'll pay.
Then, on the frontend, HikaShop will calculate the tax and untaxed amount off of that price.
So for example, if you have a 20% tax and a 0% tax configured, and you enter 120€ for the price of the product with that setting activated, users will all pay 120€ for that product. Some of them will pay 100€ without taxes + 20€ of taxes, while others will pay 120€ without taxes with 0€ of taxes.
If that's not what you want, then you want to turn off that setting.