You should use the debugger on the URL of the page of your site that you're trying to share, not your Facebook profile. So, if you're "Like'ing"
site.com/your-article, and that's the one with the wrong image in Facebook, you should use that URL in the debugger tool.
If that doesn't work, or your still having issues, please let us know what URL you're clicking the Like button from (or whatever it is you're doing) and we can investigate from there.
Thanks,
Alex