goodshots on "Photography theme -"

ok, my last post in this issue. wordpress, or the photography theme is abolutely not right working... (and that's not what I'm actually thinking) I can change, delete, move or add whatever I want, it doesn't appear in the right way.
For example: I want to add an image, that is already used in another gallery, but it doesn't appear in the new gallery. When I remove the image in the 'parents' gallery, than it shouldn't appear again, right? But it does! So, I have to delete the image completely from the mediathek and add it again...
Daniel