Weird characters appearing

When I display the documentation from the Core Docs project on my local site, it works fine.

But when I display on my api dev site, weird characters are appearing.

For example, I'm seeing this in the markup on the dev site:

<h1 id="page-title" class="title">Chapter 1. Introduction - The Drupal 8 API</h1>

vs. this on my local site:

                   <h1 class="title" id="page-title">
          Chapter 1. Introduction - The Drupal 8 API        </h1>

It is being generated from the exact same AsciiDoc output. Possibly a character encoding mishap in the DOM reading?