Multisite - Keep from using base.php

Hey all! Having a little problem understanding what I need to do in order to keep by Multisite subsite (subdomain) from defaulting to the base.php file.

In WordPress I have the Frontpage set to the “Homepage” page with the template of “Landing Page” assigned to it. It’s currently defaulting to the base.php template.

Does anyone have an idea of how I can get around this?

base.php is a wrapper, not a WP template.