After looking at your page, I turned off Gzip Page Compression in the Global Configuration area. There is a known issue with Joomla 3.x - the Facebook Open Graph Debugger and certain server configurations can prevent Facebook from scanning your page. We recommend leaving this setting disabled since your site is affected.
Please verify that the Open Graph tags are now being displayed correctly in Facebook when you share your items. It may take a few days for Facebook to rescan all of your pages. You can also do this manually for pages you are testing at our site
socialdebug.com or Facebook's Open Graph Debugger at
developers.facebook.com/tools/debug/og/object/ (using the Fetch New Scrape Information button)
Let me know if you have any further issues.
Thanks,
Melissa