Login redirection

Hello,

I use the shortcode wppb-login but it does not work.
When I type a user, good or bad, I am redirected to https://southernharvest.org.au/wp-login.php.
Then if I log in this webpage with the same login it works.

How could I solve this?

Thank you a lot!

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