Can you try enhancing the query in template file template-2c-sorted-full-width.php to –
$args = array(
'number_of_columns' => 2,
'image_size' => 'medium',
'posts_per_page' => 50,
'filterable' => true,
'order' => 'ASC',
'orderby' => 'menu_order'
);
and see if that helps? You can use the order DESC as well above. If this works, you can copy this modified page template to the child theme directory, rename the template to a name of your choice (modify Template Name: under comments at the top of the file) and then use it without worrying about an update overwriting your changes. Thanks