Login popup password alignment and error

Wen clicking the course Signup button for a course you get a popup where you have an option to select 'Already have an account'.

If you select the existing account option you get a popup with Username and Password fields.

This popup renders fine in a web browser but on a tablet the password field is misaligned.

In addition the login fails as being invalid for an existing user in both a browser or mobile device. The login for the same user works fine for the standard Wordpress login page.

Please advise.