Google+ +1 button doesn't count

Question

I have a Google+ +1 button and seems to work fine since I can see the +1 in a Google search. The problem is that the count box doesn't keep the number of +1. Am I doing something wrong? You can see on http://itransformer.es

I've added the next html tag:

<div class="g-plusone" style="display: clear" data-width="200" data-href="http://itransformer.es"></div>

and the next Javascript snippet code:

<script type="text/javascript">
  (function() {
    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
    po.src = 'https://apis.google.com/js/platform.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
  })();
</script>

Well, I've found the issue. I was using http://itransformer.es URL, while I had to use http://www.itransformer.es. Now the +1's are shown.