WRONG LINK in secondary button

I chose No for Customize this form and test to log-in. When I clicked the secondary button, which is shown as “register”, it jumped to https://birdglobal.org/login/birdglobal.org/register/
which is wrong and doesn’t exist, instead of the default register page. Same issue when I clicked the secondary button in the registration form, it jumped to https://birdglobal.org/register/birdglobal.org/login/ instead of the default login page.

I really need the default secondary button for choosing register/login. Greatly appreciate your prompt support.

Thanks

The page I need help with: [log in to see the link]