Returning to a UISplitViewController loses Master view

[EpicDraws]

I have a UISplitViewController where the master view is a list of categories, and the detail view is a collection view of images. When you tap on an image, it launches the gallery. Everything works great, however, when I dismiss the gallery, it returns to my detail view as full screen.

Is there something I can do in order to properly return to the split view? It almost seems like I want to push the gallery controller modally, but I don't see that as an option.

Thank you!