+1 button is unavailable or has stopped working

I have 3 google +1 buttons in the same wordpress page. But one of them fails when is clicked (in then float lateral widget) showing an exclamation mark.

When click again the following page is opened: +1 button is unavailable or has stopped working. I am pretty sure that none of the described possible reasons occur.

The code for both is practically the same:

// float code (malfunction)
<div id="float_plusone">
<g:plusone size="tall" href="<?php echo urlencode(get_permalink()); ?>" count="true"></g:plusone>
</div>
<script type="text/javascript">
(function() {
var po = document.createElement("script"); po.type = "text/javascript"; po.async = true;
po.src = "https://apis.google.com/js/plusone.js";
var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(po, s);
})();
</script>

// above/below posts code (works)
<script type="text/javascript">
(function() {
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
</script>
<g:plusone size="medium" callback="googleplus_click"></g:plusone>

Any suggestion about is very welcome.

This is the URL the button is sending to the server to +1.

"id":"http://bestpushchairs.net/qc21/disclosure-policy/http%3A%2F%2Fbestpushchairs.net%2Fqc21%2Fdisclosure-policy%2F"

It looks like the button is taking the href value and assuming it is relative to the current path. Try not using urlencode.