get_header() pulls content for home page but not subpages

I am a beginning WP designer, and I have added a pull-down menu of additional content to header.php to a theme I am customizing. The blue drop-down (“I am looking for”) appears on the home page, but not on any subpages. The subpages seem to be calling the same file, header.php. For example, on page.php and page-full.php, the code is the same:

<?php get_header(); ?>

Any ideas on what I’m doing wrong? Thanks!

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