Navigation hide on scrolling [smartphone tablet]...

Navigation hide on scrolling [smartphone tablet]...

Hello,
i using a responsive menu (navigation). On smartphone or tablet if i scroll over the opened menu it hides automatically...
Don´t understand why, but i think the problem has to do with multilevel dropdown.
If i uncommend:
  1.        /* cssmenu.find('li ul').parent().addClass('has-sub');
  2.         multiTg = function() {
  3.           cssmenu.find(".has-sub").prepend('<span class="submenu-button"></span>');
  4.           cssmenu.find('.submenu-button').on('click', function() {
  5.             $(this).toggleClass('submenu-opened');
  6.             if ($(this).siblings('ul').hasClass('open')) {
  7.               $(this).siblings('ul').removeClass('open').hide();
  8.             }
  9.             else {
  10.               $(this).siblings('ul').addClass('open').show();
  11.             }
  12.           });
  13.         };*/
it doesn´t hide anymore.

I rebuild it on JsFiddle (im using chrome on smartphone):