sidebar/widget issues – widget not showing, instead footer moves into sidebar

I have a client that is requesting a fitness tracking widget from weighttraining.com be set into his sidebar. I’ve copy and pasted the given code into the sidebar within a
<li> like my other functioning widgets, yet this one doesn’t show and somehow causes the footer to jump up into the sidebar in it’s place.
I thought maybe it was a javascript issue, but I used the <script> from the codex in my header.php

Here is the given code within sidebar.php

<li id="training">
   <div class='wt-widget-container cleanslate'>
   </div><script src='https://www.weighttraining.com/javascripts/widget/widget.js?user=17276&bg=2></script>
</li><!-- end training -->

Live site.

Any help and advice is greatly appreciated.