Hi,

1) Please add the css into custom.css :

#navi li.menu-item.current-menu-item > a:before { 
    -webkit-transform: scaleX(0);
    -moz-transform: scaleX(0);
    transform: scaleX(0);
}
#navi li.menu-item.current-menu-item > a:hover:before { 
    -webkit-transform: scaleX(1);
    -moz-transform: scaleX(1);
    transform: scaleX(1);
}

2) Because the origin design is that main content wrap will come down when menu icon clicked. When the menu item clicked, the content wrap will come back(changed the position, the browser would remember the position). So the anchor position will go wrong place on some browsers, so we have to remove the main wrap translate CSS:

.show_mobile_menu #wrap {
    -webkit-transform: translateY(0);
    -moz-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
}

NOTICE: clean the browser to test.
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