What is wrong with this form? It does not seem to post (get)

See the search form of this website in question:

http://ift.tt/1E0FGCV

It just defaults back to the original main page.

This is very odd, because it seems the form is set up properly.

<form action="http://ift.tt/1E0FGCV" class="search-form standard-search" method="get" role="search">
    <div class="input-group">        
        <input type="search" title="Search for:" name="s" value="" placeholder="Search …" class="search-field form-control">            
        <span class="input-group-btn">
            <button class="btn btn-default search-submit" type="submit" id="searchsubmit"><i class="fa fa-search"> </i></button>
        </span>
    </div><!-- /input-group -->
</form>

What is causing this?