WordPress Theme Login Button Loads EC2 Public DNS, not Masked URL

Hey everyone,

Just set up a new WP installation on an Amazon EC2 instance here. I’ve successfully masked the EC2 Public DNS with a custom domain name. However, when I click the Login button in the header or in the Meta Widget, it loads up the login page using the Public DNS as the URL, instead of the custom domain name.

I believe this is a theme-based issue, as the Twenty Fourteen theme works fine and loads the login page using the custom domain name, but when I activate the Buddy theme from GhostPool, the issue occurs.

Any ideas on how to correct this? Thanks!