AddThis

Addthis div is disappearing from layer after closing and reopening

I'm using the block of code below in a layer that after refreshing the page or coming to it for the first time works fine, but only the first time. After closing said layer and reopening it, this block of code never reappears on my web page unless I refresh the page.

<!-- AddThis Button BEGIN -->
<div class="addthis_toolbox addthis_default_style addthis_32x32_style">
<a class="addthis_button_facebook"></a>
<a class="addthis_button_twitter"></a>
<a class="addthis_button_google_plusone_share"></a>
<a class="addthis_button_readitlater"></a>
<a class="addthis_button_compact"></a>
</div>
<script type="text/javascript">var addthis_config = {"data_track_addressbar":true};</script>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=ra-4f8873e46704144c"></script>
<!-- AddThis Button END -->