Registration form redirects to "there is no account with this email"

Hello,

I’ve got a problem with registration form. When i fill up the registration form then I press “Register” button and when i finally do the captcha it redirects me to forgot password page with message, that there is no account with this email.

I checked the “Customers” page in shopify admin panel and i haven’t found new account that I have created literally 30 sec. ago..

Where should I search the problem?