not sure what you mean by ‘menu_order’, but the ‘menu_order’ parameter is set to ‘1’. If we use the new updated version 1.21.2, all of the latest job postings (since the update), are shown at the end of the jobs list when using the shortcode [jobs]. However, the ‘recent jobs’ widget (used as a sidebar) orders the job listings correctly.
If we return to the previous version of wp-job-manager (using the same database), all of the jobs both on the main page (using the [jobs] shortcode), and the widget, show the jobs listed in the correct order. Could you please let me know if it is ok to return to the old plugin whilst you work on a fix?