Comments Tab Not Working

Hi any ideas why my Comment Tab isn’t working?

<a></a>
 
<div class="pull-right hidden-xs">[D_SOCIAL]</div>
 
<h1>[TITLE]</h1>

<div class="mainlocation">[LOCATION]  [phone] </div>
 
<div style="border-top:1px solid #efefef; margin-top:10px; margin-bottom:10px; padding-top:10px;">
[RATING class='pull-right']
[FAVS class='btn btn-primary'] [CONTACT style=1] [BTN key="url" text="Visit Website"]
</div> 

<div class="panel panel-default">

<div class="panel-body">   

[IMAGES type="images"]

<div class="clearfix"></div>

<hr /> 

[GOOGLEMAP text_after="<hr />"]

<div class="clearfix"></div>

<div class="pull-right hidden-xs">[DATE]</div>
        
<ul class="nav nav-tabs" id="Tabs">
        
        <li class="active"><a href="#t1">{Description}</a></li>
        
        <li><a href="#t2">{Details}</a></li>

        <strong><li><a href="#t3">{Comments}</a></li></strong>
        
        <li><a href="#t4">  </a></li>
        
</ul>
 
<div class="tab-content"> 
        
        <div class="tab-pane active" id="t1">[TOOLBOX] [CONTENT] <hr /> [RELATED] </div>
        
        <div class="tab-pane" id="t2">[FIELDS hide="map"]</div>
        
        <div class="tab-pane fade" id="t4">[COMMENTS tab=0]</div>
       
</div>

</div></div>