There is nothing wrong with your site.
You have in Admin => Showgallery Options you have this set which says members gallery contains all photos and indeed it shows 26 photos. You have 3 photo links for 3 members
Do you want Members Gallery to show all of a users photos?
Next you have a parent category that says 17 photos cause it has one photo and its child category contains 16 photos
Everything is showing as it should.