Can’t hover on Submenu

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Reading through your question, your submenu is on

  • class,normally your hover style is working on.. so we can use a filter “nav_menu_css_class” on your functions.php file. 
    add_filter('nav_menu_css_class' , 'special_nav_class' , 10 , 2);

function special_nav_class ($classes, $item) {
    if (in_array('current-menu-item', $classes) ){
        $classes[] = 'active ';
    }
    return $classes;
}

    it would be more easy to figure-out the error, if you can share your code and screenshots. Hope this will solve your issue