You can't import photos that are greyed out. The reason they are greyed out is that they have been previously imported into Lightroom. So ...
Go to the main Grid in the Library Module, click on All Photographs in the catalog panel, find one of these photos and then right-click on it and select Go to Folder in Library; this will tell you where to find the photo in your Lightroom Folder panel.
Thanks for your reply. I understand that the greyed out photos are already in LR. And I don't really care what folder they are in. I want to know why they did not import in their original folders and how I can correct that. Right now I am removing all the files that are not in their correct folders so I can re-import the folders. But this is a long process and I wonder if there is another way to correct this within LR.
They probably didn't import into the desired folders because you (accidentally) select Move instead of Add.