Probs in title when sharing events to a social network

I've recently added my first event and when I use the share button and click share to facebook the Title and Description does not show properly 

Instead it says:

Access Denied
http://sitename.com/m/events/view/Win-a-free-20-Phone-Topup

The title shows correctly when I share it on twitter like:

Win a free $20 Phone Topup: http://siteurl.com

The Page is public so unsure why it's not sharing properly on fb or myspace.

Am using the lastest version of Dolphin 7.0 

If you go to http://social.thuggndivasfbcovers.com/m/events/view/Win-a-free-20-Phone-Topup and where it says "Share This" Block...click Facebook logo and you'll see what I mean..

Can anyone help with this?

There is a simple reason for that. If you visit your page as guest you can see it shows access denied. So, facebook is exactly the same, its also a guest here. Obviously it can't login.