UNGROUP - Theme specific

The home page of this site (as insatlled) has elements that are grouped (on the home page) consisting of text over an image. I am using these elements as links.
I have successfully edited text and changed the background image. All good!
However if I 'ungroup' the element the image disappears and the text remains - I am then unable to recreate the element.
I can't work out how this element was put together in theme and so I am one link short!