Hi,
The checkout has been customized on your website to remove the radio buttons which allow the customers to easily see which payment method is selected.
Also, I can see that you're using the old checkout system of HikaShop.
I would recommend switching to the new checkout of Hikashop by turning off the "checkout legacy" setting of the HikaShop configuration.
That will remove the customization of the checkout as it will use new views etc.
Otherwise, you can look at the CSS around the payment method selection area with your browser inspector (F12) and look for the CSS hiding the input radios.