Coen,
There's nothing in our extensions that will default the Like button to sourcecoast.com. That'd be a bit shady, and not something we do.
When you use the {JFBCLike} tag, it should always use the current URL of the page. If that's not the case, something is off. One possibility is the Open Graph tags of JFBConnect. In the Social -> Open Graph tab, make sure that you have -not- set a default value for url. If so, then all Likes for your site will inadvertantly be for that URL.
If that's not the case, please post (or Private Message) a URL from your site that has this issue. We'll definitely investigate more, as something obviously is off.
Thanks,
Alex