Ninja Forms added code to my jobs page I can't delete

Hi, I installed Ninja Forms to use with WP Job Manager and it didn’t work at all for me. So I deactivated it. Ninja forms seems to have put this code into my page ([ninja_forms_display_form id=””]) and I can’t remove it at all – see
https://visualsense.com/ep_wp_staging/job/temporary-senior-export-shipping-co-ordinator/
I’ve deleted nija forms, I’ve reinstalled the WP Job Manager plugins. Nothing. We go live in 2 days and I can’t have this code on the page as it’s not even wrapped in anything I can’t even hide through css.
Please help asap.

https://www.ads-software.com/plugins/wp-job-manager-ninjaforms-apply/