Multiple text objects in one scene

I've managed to add text components onto each of the objects in a scene successfully (see attached screenshot) but when I build the game, only the lowest object with a text component actually renders in the scene. If I drag a different object with a text component underneath it, that one will render instead.

The object containers themselves are rendering fine. Their mouse and click events all work, and if I add an image to them, that appears perfectly too.

What am I doing wrong?

Cheers

Tom