This was an old discussion. I had to take some time to recap.
So i guess that you applied my latest suggestion removing the 'parent' class in the file yourjoomlapath/templates/responsivizer/html/mod_menu/default.php

If so that's the problem, it works ok for the first menu but it removes the possibility to open sub-items in the below sub menu. So you can't do that, or at least you should do that only for the main menu for example evaluating the menu ID.

By the way among thousands of users you are the only one with problems about the menu, i'm still not understanding why