Trouble getting themes to display properly on a multisite network

We’re attempting to set up a multisite network on an Amazon server.
We had some trouble getting it set up to show the subdomains, but we eventually got it to show. Our site is this ‘ec2-54-144-154-60.compute-1.amazonaws.com’ with two subdomains; school1 and school2. Because the domains school1.ec2-54-144-154-60.compute-1.amazonaws.com and school2.ec2-54-144-154-60.compute-1.amazonaws.com do not actually exist, we had to basically fake it by editing our HOSTS files locally to make our computers believe that they do exist. With that in mind, the only way ill be able to show what issues we’re having is through screenshots.

The issue we’re now facing is with Themes. I’ve installed a theme that we’ll be using and Network Enabled it. I applied the theme to the main network domain site and it works fine. However, when I applied the theme on the school1 subdomain, the theme is completely broken.

Here’s how it should be showing and how it is showing on the main domain:
https://imgur.com/jNZKr95

Here’s how it is showing on the school1 subdomain:
https://imgur.com/rKI2YE4

We’re fairly new to wordpress multisites (and wordpress as a whole), so any help will be GREATLY appreciated!