This is likely because you have a "Secure Canvas URL" and "Canvas URL" set in your Facebook application. When those are set, Facebook will try to send request accepts to your Facebook Canvas page and not to your actual site.I dont have SSL on my site, and i dont want to track the requests. When a request is sent, the notification reaches the users friend, but on clicking a Site warning page appears "Connection is untrusted" Screen shot attached for reference.
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