Ember direct access to URL doesn't render, but navigating from homepage works

I have an ember application that is breaking if I try to direct access a URL sub route. If I navigate to the homepage and then to a sub route, it loads properly.

The issue that I'm seeing with direct access is the page outputs the HTML to the screen instead of parsing it, loading the JS libraries, and showing the normal content.

I work for a large corporation and can't post the site code, but would appreciate some help with common causes of this behavior, or likely causes where I can troubleshoot.