Using Lightbox

Hi,
I use multisite with one main site for managing a few images for all related sites.
Now I want to use lightbox (responsive lightbox from dFactory) to show the full-size image.
If I place the shared image with the width 150 px lightbox shows the image with 150px size, not the size I configered on lightbox.
Is there a solution for that? or is this a known issue?

Thanks a lot
Stefan

https://wordpress.org/plugins/network-shared-media/