Fixed navigation in Pacific doesn't scroll into view on secondary pages

I'm customizing a site (see here). One thing I've noticed is that the navigation bar, which retreats & then scrolls back into view on the homepage as you scroll down through the sections, doesn't replicate that behavior on other pages. For example, the blog page, or one of the other program description pages which has longer scrolling content. It looks like the class 'show' is being dynamically injected after the first page section on the homepage.

1. WHY? (more of a rhetorical question...)

2. How to copy over this scroll/hide/reveal behaviour to the other pages - not just home?

I'm also searching for a solution to this! Can't work out how to have this scroll on all pages.

Looking for the same answer.