Hello!
Thanks for getting in touch with us. My name is Muhammad.
I see the menu items showing the drop menus or mega menu. Can you please tell me which menu item specifically is not showing submenu/mega menu?
If you have changed a page and want to change its link in the menu item. You can do it from the:
wp-admin>>appearcnes>>menu
Or please share the wp-admin details and URL with me so I can change the link.
Thank you!