I've made a little progress with this issue:
A month or so ago I made a fan-page which I am no longer using and that is scheduled for deletion. That is the page that the JFBC is "liking" and trying to "send" when using the module. I cannot find where to edit this, change it or delete it.
I have gone as far as deleting and making a new FB app but that made no difference.
I couldn't attach this, so I'm putting it here.
The box in yellow indicates that this page (which is scheduled for deletion and is no longer used) is linked to my website and seems to be causing the problem.
Any thoughts?