如果在调整浏览器大小时单击链接，则下拉菜单将消失

Question

导航栏中的下拉菜单在浏览器最大化时工作正常，但如果我将浏览器调整为移动大小，则下拉菜单不会显示，菜单按钮也会切换。这是我的带有下拉列表的导航栏代码。我正在使用bootstrap 3.当我点击EBBL时，下拉菜单没有显示，整个导航栏菜单都被切换了。

<nav class="navbar navbar-custom navbar-fixed-top" role="navigation">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-main-collapse">
                <i class="fa fa-bars"></i>
            </button>
            <a class="navbar-brand page-scroll" href="<?php echo site_url('home/index')?>">BCTF</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-right navbar-main-collapse ">
            <ul class="nav navbar-nav">
                <!-- Hidden li included to remove active class from about link when scrolled up past about section -->
                <li class="hidden">
                    <a href="#page-top"></a>
                </li>
                <li>
                    <a class="page-scroll" href="<?php echo site_url('home/index')?>">Home</a>
                </li>
                <li>
                    <a class="page-scroll" href="<?php echo site_url('home/show_about')?>">About</a>
                </li>
                <li>
                    <a class="page-scroll" href="<?php echo site_url('home/show_open_butterfly_park')?>">Open Butterfly Park</a>
                </li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false" >EBBL<span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="<?php echo site_url('home/show_ebbl')?>">About EBBL</a></li>
                        <li><a href="#">Content 1</a></li>
                        <li><a href="#">Content 2</a></li>
                        <li><a href="#">Content 3</a></li>
                        <li><a href="#">Content 4</a></li>
                     </ul>
                </li>
                <li>
                    <a class="page-scroll" href="<?php echo site_url('home/show_biography')?>">Biography</a>
                </li>
                <li>
                    <a class="page-scroll" href="<?php echo site_url('home/show_gallery')?>">Gallery</a>
                </li>
            </ul>
        </div>
        <!-- /.navbar-collapse -->
    </div>
    <!-- /.container -->
</nav>