Why I cannot complete my order at Luottokunta verification page?

Why I cannot complete my order at Luottokunta verification page? I can insert my credit card details but the accept and cancel buttons do not work.

Due to safety reasons Luottokunta doesn't accept several contacts from the same address within the same session. If you have already proceeded to Luottokunta page once within the same session, please close and restart your browser before making another order.