View the source of the html page.
At the top, in the head section, there should be a "<script>" tag with a link to the jxsharelink.js file.
It should look like this:
| Code: |
<script type="text/javascript" src="http://bashiri.se/plugins/content/jxsharelink/jxsharelink.js"></script>
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If you don't have that on the page with the icons there is some sort of bug. You could try to temporarily turn off the cache in Joomla and see if that helps.
It would also be a help if you could turn on displaying of javascript errors in your browser. If the script doesn't manage to add the link properly there should be some sort of error showing. Possibly down in the corner of the browser.