If this didn't work you might have a problem with your og:titles,

Try one of the following

• Disabling any SEO plugin you might have and see if that fixes the problem
• Check your URL with Facebook Debugger
• If you are using a template ask the template developer if it's framework is trying to manually OG titles

The problem was tested without installing any seo plugin.
On the Facebok Debugger I didn't get any error.
I paste the url to facebook page and the item was imported to my wall, with the right url.

Also I have already ask the joomlart if they know about this issue.

I test the site without the template and sh404 and again the addthis share the category and not the item.

How can I test it?

I have disable the plug ins that item has, but again the addthis sharing only the category and not the item.