There's a way to protect the login page with captcha. But when I do so, the captcha code has to be resolved. When the login page is loaded on small screens, everything works fine, i.e. the captcha frame is visible. But when I click the login link on a big screen, some small frame pops up on the current page, and the captcha frame is missing there. There's no way to login from the frame with captcha enabled. When failed, there's a redirection to the full login form page with the captcha frame, and there I can log in without problems. Is there a way to remove the little login frame, and redirect the user to full login page when the login link is clicked?

@morfik
Can you reproduce on default Sigma theme?

It's about the theme. I'm talking about this pop up (see the first attachment). But the login form has captcha(see the second attachment).

It will not work in generated box