I found the source of the issue in my case, but this probably won't apply to anyone that's not using the WP Jumpstart theme. I had the following in my child theme functions.php file:
function show_page_content() {
the_content();
}
add_action( 'themeblvd_content_top', 'show_page_content' );
I have no idea how or why that got there, but removing it fixed the problem.