I can't edit or crop my phone's home display wallpaper on portrait mode Device: Samsung Galaxy Y S5360

Why can't I edit or crop images or photos in portrait format on my phone? What do I do to fix this issue?

When I try to change the home display wallpaper of my phone, the landscape crop mode works just fine. But when I try to use the portrait crop mode, it doesn't work.
You can try Wallpaper Wizardrii.