Hello there, @user32448 
Thank you so much for the feedback!
You can open the hidden reviews and show them again using the button at the top of the editor:
Unfortunately, settings don’t offer an option to completely delete reviews collected via widget, but our devs can manually do this on their end. Please let us know which reviews should be removed and we’ll delete them fro, your widget.
I also think that it would be great to have a “Delete a Review” button right in the settings and I’ve added this idea to the Wishlist on your behalf - Option to delete reviews collected via widget.
Regarding the total number of reviews, all reviews submitted through the widget have been added to the total number. The thing is that the current number of Facebook Reviews is 2, but one deleted review is still displayed in the widget, which causes confusion.
I’ve passed this issue to the devs and they’ll completely remove a deleted Facebook review from the widget.
As for the, “x minutes ago on” I’ve also shared this request with the devs and they’ll adjust this issue in the widget.
I’ll keep you updated 