Hi,
It's been 6 years that's we're suggesting to turn off the "show taxed prices" setting of the HikaShop configuration/menu items, if you don't want to display the prices with taxes because it's been that solution to that question all the time.
I don't see why that option would remove the price on the cart product listing. Since we don't have such problem on our end, it's hard to advice on anything concrete. Could you provide a link to a product of your website with the issue so that we could see the problem ? A screenshot of the settings of the product would be great too.