Problem with Comments/Like -- Wrong Encoding

Hello,

I have subscribed for the JFBConnect, I downloaded it and install it. Generally it works fine and it's a nice component,
but there is this problem. When I press "like" or when I comment some articles, their title doesn't appear with greek characters on facebook.
It looks something like this: Τραγούδι για την περιπέτεια της υγείας του.
What is really weird is that it doesn't happen to all the articles, only to some, without them having any different attribute.
The website is written in greek.

Any help would be really appreciated.

Thank you in advance

Hello

Thank you for the reply. I have already used Facebook's debug tool and the result is that on the articles that are displayed correctly, the debug is correct
and on the weird characters articles is not correct. Since I can't reveal the client in public, is it ok if I sent you a pm with the links?

Thank you