It sounds like you imported the new photos to a different folder, perhaps because you selected COPY or MOVE? What happens if you click on Previous Import, does that show you the photos of interest?
Previous Import imports the original group of 16 pictures I was working with. When I click on the folder that those pictures are in, it should show me about twice that many pictures, but still only shows those that I have already edited.
So look in other folders, they probably are there (by accident).
An explanation- if I think I know what you are asking!!
Lightroom does not "show" unedited images-
If you edit (or Develop) an image in Lr, that is what you see in the library grid, the film-strip, Loupe view or Develop module!
You can view what the unedited photo looks like in Develop module by pressing the back-slash key [ \ ] or clicking on the first (Import) line of history, or creating a Virtual Copy and Clicking [Reset].
You have to understand that 'editing' a photo in Lightroom does not create a new file. (All that "Non Destructive" stuff) For a 'copy' with the edits applied- that requires an "Export" of the photo- as you see it.
Lightroom shows unedited photos if you haven't edited them yet, which is the way I understand the original question.
My statement -"Lightroom does not "show" unedited images-" is mis-leading! sorry.
It should say "Lightroom does not 'show' unedited images as a second thumbnail in addition to the edited version."
I think what Jonny (the OP) is expecting to see is that as he 'Edits' an image then that photo will show as an additional file in the folders. (As you would see when you 'Save as a Copy' in a pixel editor)
After editing an image in Lr there is not another photo to Import from folders.