Summary

When a page has certain macros it makes the top header not fixed, which means when you scroll the page down the top bar disappears from view. 

Steps to Reproduce

1. Create a page and add some lines of content to make it scrollable
2. Add the Roadmap Planner or the Change History macro at the bottom

Known Macros that cause the issue

1. Roadmap Planner
2. Change History macros
3. Table of Content Zone macro

Expected Results

Scrolling down the page the top header would be fixed

Actual Results

The top header goes away

Notes

The browser's development tools shows the header with a missing class element

<header id="header" role="banner">

Whereas a working page would show and additional "class" element that upon scrolling would add the fixed-header valure:

<header id="header" role="banner" class="fixed-header">