In the Popup Gallery section on the edit screen of post list pages you can specify the properties of the popup slideshow that you want to open from the post list. On this page, the following settings are specified:
Popup Galleries: _default
Separate Popup Galleries: disabled Gallery Popup: Fullsize Single - Right Panel
The "_default" value means that the popup slideshow will display the default gallery of the posts appering in the post list. Since the "Separate Popup Galleries" option is disabled, the popup slideshow will display the default gallery of all posts not only the selected one.