Double-click

-- url of the page with the problem -- : psykursi.ru/internet-magazin.html
-- HikaShop version -- : 3.3.0
-- Joomla version -- : 3.6.5
-- PHP version -- : 5.6.30-0+deb8u1
-- Browser(s) name and version -- : Opera 53.0

Hello. On the payment selection page, you need to double-click on the button.

In this case, another problem arises - no notification of the sent letter is given. There is no registration.

I switch new checkout.Sometimes it appears during registration, sometimes does not appear:
"Your account has been created and the activation link has been sent to the email address you provided during registration. Please note that you must activate your account by clicking on the activation link specified in the email, after that you will be authorized to log in.''

Thanks, now works.