Bytebitten

Check the CSS file (style.css).

There you find “.header ul.menu li” and “.header ul.menu li ul li”.
The first is for -sub2_1 and the second for -sub2_1_1

You will have to create a “.header ul.menu li ul li ul li” yourself for -sub2_1_1_1

I see you still missing the footer on your site.
Check if the index.php and page.php still have the <?php get_footer(); ?> at the end.

Else you want to lay your versions next to the originals and check if functions are missing.