Tap popup to close problem

When tapping something to create a popup, tapping the popup image sometimes closes the popup, and sometimes tapping the popup image doesn't close the popup. 

How do I create all popups to be either tap and close, or not tap and close? At the moment, the way I'm creating all popups is consistent, and I do not know why some popups are tappable to close, and non-tappable to close.

thanks,

-Troy