I've never seen what Facebook is doing with your site before. Basically, it seems like it really can't read your tags for some reason, but I'm unsure why. I tried the Facebook Debug tool above, and you're correct, it's not seeing the proper tags on that page. The strange thing is that it's not seeing the proper tags on any page.
Every page from your site I tried to scrape has the type set to 'website', the title is always just your domain name, there's no description and no image set... even though, on all of those pages, the proper Open Graph tags are set.
Additionally, if you use the "See exactly what our scraper sees for your URL" link at the bottom, it will just be a blank white page.
All that adds up to Facebook not being able to scan the content of your site for some reason. That could be:
* A firewall/security feature on your server/apache/Joomla that's preventing bots from scanning your page
* A bug within Facebook's scanning tool (not entirely uncommon)
* A blacklist for your site within Facebook (uncommon)
All I can suggest is to make sure you aren't blocking requests from Facebook in anyway (or any other bots, like search engines). If it doesn't seem like you are, I'd submit your issue into
Facebook's bug reporting tool
.
I hope that helps,
Alex