I found the problem here. It was with the $this_page
variable, it was referencing the homepage still and kept the about page from working. I had to simply modify how it was pulling the page ID and storing it.
Here’s my amended code.
<?php
/* Template Name: Page- Home */
get_header(); ?>
<?php
$this_page=get_the_ID();
$loop = new WP_Query( array('post_type'=>'page', 'posts_per_page' => -1, 'post_parent' => $this_page, 'orderby' => 'menu_order', 'order' => 'ASC') );
while ( $loop->have_posts() ) : $loop->the_post();
$template = get_post_meta( $post->ID, '_wp_page_template', true );
?>
<?php include(locate_template(array($template), false, true)); ?>
<?php endwhile; wp_reset_query(); ?>
<?php get_footer(); ?>