menu behavior is not as expected

First thing i would do is register 2 menus,

<?php function register_my_menus() {register_nav_menus(array('primary' => __( 'Primary Menu' ),'topnav' => __( 'Top Nav Menu' ) ) ); } add_action( 'init', 'register_my_menus' ); ?>

second in wordpress menu panel i would create two menus and assign each to a display location Third i would display the menus using

<!-- HEADER ========================================================================================== -->
<header class="site-header" role="banner">
    <!-- NAVBAR ====================================================================================== -->
    <div class="navbar navbar-default" role="navigation">
            <div class="container">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="navbar-collapse">
                        <span class="sr-only">Toggle navigation</span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>
                </div><!-- navbar-header -->

                <!-- If the menu (WP Admin area) is not set, then the "menu_class" is applied to "container". In other words, it overwrites the "container-class". -->
                <?php wp_nav_menu( array( 'theme_location' => 'topnav' ) ); ?>

            </div><!-- container -->
        </div><!-- navbar -->
    <div class="navbar-wrapper">
        <div class="navbar navbar-inverse" role="navigation">
            <div class="container">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="navbar-collapse">
                        <span class="sr-only">Toggle navigation</span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>

                    <a class="navbar-brand" href="https://wordpress.stackexchange.com/"><img src="<?php bloginfo('stylesheet_directory'); ?>/assets/img/Logo.png" alt="UpAbility"></a>
                </div><!-- navbar-header -->

                <!-- If the menu (WP Admin area) is not set, then the "menu_class" is applied to "container". In other words, it overwrites the "container-class". -->
                <?php
                    wp_nav_menu(array(

                        'theme_location'    => 'primary',
                        'container'         => 'nav',
                        'container_class'   => 'navbar-collapse collapse',
                        'menu_class'        => 'nav navbar-nav navbar-right'
                    ));
                ?>

            </div><!-- container -->
        </div><!-- navbar -->
        </div><!-- navbar-wrapper --></header>