Ok, first I thought you weren't blitting the other text to the screen at all, now I see that you are, but you are doing it inside another sprites update() method. The problem is that when you do
dirty = all.draw(screen) It is only getting dirty rectangles for each sprite that is in all. So it is only updating the rectangle belonging to the textsprite.image. The other text displays should be individual sprites according to this architecture, or you could have an overlay sprite that blits them to a larger .image. Hope that helps you figure it out, although my description isn't so good.
