I also had this problem. I created a referrer URL to give lenders a link, so for each user who wanted to share something, there was a different URL. The referrer link will provide the user with credit and redirect to the login page of my site. With this configuration, a similar dialog will appear for a moment, and then disappear again, unless I go to the facebook debugging tool.
For me, the problem was to go from redirecting to displaying the page directly from my referral link. In fact, I changed the referral link as the ?r=refid on my root URL. It seems to work correctly if facebook doesn't have to follow the redirect to get the og: data.
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