Can you explain more about what you've set up? Are you using an Open Graph Action button and, if so, what action have you configured.
With Open Graph Actions, you need to submit them for approval to Facebook before they can be used by non-admins of your site.
I hope that helps explain a little more, but if not, let us know more about the configuration and how we could test the button you setup and we'll gladly help however we can.
Thanks,
Alex