Problems and errors importing comments

Hi

I posted a comment here:
https://premium.wpmudev.org/forums/topic/ultimate-facebook-7#post-310292

Sorry for double posting. I have similar problems.

1) Please correct me if I´m wrong. The Import Facebook comments option SAVE all the comments made with the facebook comment app to my wordpress database. It is supposed to work in that way?

2) If the above is correct. Then, I´m not getting any of the new comments to my database although the Import Facebook Comment option is ticked. I don´t see any of this comments made with facebook app displayed under the Wordpress Comments list in the admin panel. What can be causing this?

3) I don´t know if this is related but I´m getting an error with the facebook developper debug tool wich reads:

Errors That Must Be Fixed
More Than One OG URL Specified:	Object at URL 'http://www.pergaminodezenit.com/uncategorized/prueba/' of type 'article' is invalid because it specifies multiple 'og:url' values: http://www.pergaminodezenit.com/uncategorized/prueba/, http://www.pergaminodezenit.com/uncategorized/prueba/.

Please help here. In the past I used the Comment Plus plugin without problem, it imported the comments to my database. But I delete that plugin as I prefer to use just Ultimate Facebook.