Can anyone explain this picture?

This is really puzzling me!

Have a look at the third row from the bottom* in the author gallery for the John Adams legacy library:
http://www.librarything.com/authorgallery/JohnAdams. There are two pictures labelled Voltaire: the first is the 18th century Voltaire. The second has a 20th century look, and from the link is actually a picture of Victor Thaddeus, http://www.librarything.com/author/thaddeusvictor, who wrote a book about Voltaire.

What I don't understand is where this picture is - it doesn't show up in the author gallery for either Voltaire(1) or Voltaire(2). If it's attached to one of the many variant names combined with Voltaire, is there any way of finding out which page that is?

*Edited to add: of course this may display differently for other people: the pictures in question are the 15th and 16th from the end.

I don't see it. I see only one image labeled Voltaire. Maybe someone's fixed it.

Yes, it's gone now. Which leaves me as puzzled as before - how did whoever fixed it find it?