Wordpress Bootstrap theme not working on mobile

//setting style sheet locations
    function themeStyles() {

        wp_enqueue_style( 'bootstrap_css', get_template_directory_uri() . '/css/bootstrap.min.css' );
        wp_enqueue_style( 'main_css', get_template_directory_uri() . '/style.css' );
    }
    add_action( 'wp_enqueue_scripts', 'themeStyles' );


//fallback for < ie9 
    function themeJS() {

        global $wp_scripts;

        wp_register_script( 'html5Shiv', 'https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js', '', '', false );
        wp_register_script( 'respondJS', 'https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js', '', '', false );
        //load
        $wp_scripts->add_data( 'html5Shiv', 'conditional', 'lt IE 9' );
        $wp_scripts->add_data( 'respondJS', 'conditional', 'lt IE 9' );
        //add
        wp_enqueue_script('jquery');  // Enqueue jQuery that's already built into WordPress

        wp_enqueue_script( 'bootstrap_js', get_template_directory_uri() . '/js/bootstrap.min.js', array('jquery'), '', true );
        wp_enqueue_script( 'script_js', get_template_directory_uri() . '/js/script-min.js', array('jquery', 'bootstrap_js'), '', true );
    }
    add_action( 'wp_enqueue_scripts', 'themeJS' );


//Customise menu 
    add_theme_support( 'menus' );

    function registerMenus() {
        register_nav_menus(
            array(
                'header-menu' => __( 'Header Menu' )
            )
        );
    }
    add_action( 'init', 'registerMenus');

//setting style sheet locations
    function create_widget( $name, $id, $description ) {
        register_sidebar(array(
            'name' => __( $name ),   
            'id' => $id, 
            'description' => __( $description ),
            'before_widget' => '<div class="widget">',
            'after_widget' => '</div>',
            'before_title' => '<h2>',
            'after_title' => '</h2>'
        ));
    }

    create_widget( 'Section 1 Left Box', 'row1left', 'Row 1 - This is the left section' );
    create_widget( 'Section 1 Left Box2', 'row1left2', 'Row 1 - This is hidden until button 2 is pressed' );
    create_widget( 'Section 1 Left Button', 'leftbutton', 'Row 1 - Left button' );
    create_widget( 'Section 1 Right Button', 'rightbutton', 'Row 1 - Right button' );
    create_widget( 'Section 1 Right Box', 'row1right', 'Row 1 - This is the Right section' );

    create_widget( 'Section 2 Left Box', 'row2left', 'Row 2 - This is the left section' );
    create_widget( 'Section 2 center Box', 'row2center', 'Row 2 - This in the middle section' );
    create_widget( 'Section 2 Right Box', 'row2right', 'Row 2 - This is the right section' );   

    create_widget( 'Section 3 Right Box', 'row3left', 'Row 3 - This is the left section' );
    create_widget( 'Section 3 Right Box', 'row3right', 'Row 3 - This is the right section' );