WordPress gallery shows selected images, single image page showing all.

Hi,
I did a topic on my problem a week ago but did not have any success at all so I closed it and now try to change my formulation to hopefully see a helping hand coming ??

I did a child-theme from twenty thirteen visible here:
https://www.franskmann.no/WPA

Selected picture are shown on the GALLERY page ; if you click on one of them, and stay in the “single image page” and navigate there you could browse through all the images attached to GALLERY page.

Is there a simple way to limit the navigation to the images selected and shown in the GALLERY page?

Thanks for your time and, I hope, input on this.