The obvious answer is that sweetdate_walker_nav_menu, which is the walker that creates this menu, is written is such a way as to not print those classes. It is hard to say for sure without seeing the code for that custom walker but you can remove the 'walker' => new sweetdate_walker_nav_menu argument to verify that that is the problem. If it is you’d have to write code into the walker so that it uses those classes.
There is also a filter called nav_menu_css_class which I believe is what one would use to remove those classes. However, there are numerous other filters in nav-menu-template.php and nav-menu.php that could potentially be involved.
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