If you look a little further down on the pricing page, you’ll find the following text:
“All pricing excl. VAT which will be applied for EU customers according to EU rules on order. We do not support VAT-free sales to VAT-registered companies within the EU. To start using AxCrypt you have to sign up for an account. A 30 day trial of AxCrypt Premium is included and will start when you activate your account.”
So there’s nothing wrong with the pricing, it’s just that you need to pay VAT on top of the €24.