Pasting my link on facebook shows wrong description

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Hi, I configured the info on URL, keywords and greetings and once I am on my main page I am able to check them. But IF i copy and paste my domain on Facebook, the askbot's title and descriptions are displayed. I've tried to search for this content on the html on my website, but I couldn't find it. AFAIK, the title and description should come from the metatags on my html, but these look good. Anyone could explain why do I get the default values instead of my custom values?

thanks!