Here’s the site: https://dev.pinnacleone.solutions/
I have the shortcode plugged into the page that you are presented with (the member options page). However, when the fields are filled out and you click Log Me In, it doesn’t log you in. Instead, it redirects you to the static login page: https://dev.pinnacleone.solutions/wp-login.php
I’ve got a test account available so you can see it happen:
username: pinnacletest01
password: testpassword123!