The submenus in the 3rd menu choice can’t open in the mobile menu view, as the (3rd) main menu item is a link itself.
So when you click on it you go to the linked page and there is no way to unfold the submenus.
In desktop view the submenus open (unfold) on hover.
I know that’s the way it should happen. Just asking if there is any trick to make this work somehow.