Bootstrap navbar-collapse not working on small ans xs devices - twitter-bootstrap-3

Question

Can anyone look at this and tell me what am I doing wrong? Other bootstrap - java script elements are working on this webpage.
Navbar icon is visible, and seems that it' working, but it dont display menu.
This is my code:
<nav class="navbar navbar-default">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<?php
wp_nav_menu( array(
'menu' => 'primary',
'theme_location' => 'primary',
'depth' => 3,
'container' => 'div',
'container_class' => 'collapse navbar-collapse',
'container_id' => 'bs-example-navbar-collapse-1',
'menu_class' => 'nav navbar-nav',
'fallback_cb' => 'wp_bootstrap_navwalker::fallback',
'walker' => new wp_bootstrap_navwalker())
);
?>
</ul>
</div>
</div>
</nav>

Answer 1

The HTML on your website contains two tags with id "bs-example-navbar-collapse-1". This is the HTML I am seeing on the website:
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<div id="bs-example-navbar-collapse-1" class="collapse navbar-collapse">
<ul id="menu-menu-1" class="nav navbar-nav">
<li>....</li>
<li>....</li>
<li>....</li>
</ul>
</div>
</ul>
</div>
Notice the two and tags. Removing the duplicates will sonve your issue.