Are you running an Ad-blocker? If so it may be mistakenly blocking part of a legitimate dialogue. Then the display makes no sense because part of it is missing.
If you have one, temporarily disable the ad-blocker and try again.
As Facebook controversially tracks internet users whether or not they have a Facebook account, it's possible a browser plug-in other than an ad-blocker is whacking the dialogue for privacy reasons. I have DuckDuckGo Privacy Essentials installed, which blocks Facebook connections by default. As other security software packages do the same, a setting may have to be relaxed to open the door.
Dave