Problem with my background picture

From the nowhere my background picture on the blackberry, only shows a 3/4 of it.
I've tried with other pictures and the same. But it's only the bac pic, not the screen, cause I can see the complete icons and all that. The issue is only with the background picture. How can I fix it?
Thank You so much for your help.

A screenshot may clarify your point.

This occurs when you zoom in a couple of times, on the picture, and then you zoom out once and set it as a wallpaper. Just don't set the picture as a wallpaper after zooming out.