Hello, I am having the same issue…
you can see my example here: danielcnolan.com/photography/
I have 4 images for my landscapes, 1 for flora, and 1 for fauna.
If you click on any of them to open the FooBox, you can see they all say “item # of 6”.
I wanted them each to be their own gallery.
I am using FooBox free.
(btw, this is my favorite gallery plugin…I’ve spent the last two days trying out a LOT of different gallery plugins and this has everything I was looking for. Thank you!)