When you create a gallery on the Manage Galleries page, GSP assigns a path that is based on the current portal and page. If you create more than one gallery on that page, they will all end up with the same path.
Notice the documentation on that page (click the little blue button next to Manage Galleries) says this:
Quote:The Create gallery link creates a new gallery, including a default set of gallery settings. After creating a gallery, one of the first things you should do is update the media files path on the Media Objects - General page.
Roger Martin
Creator and Lead Developer of Gallery Server Pro