Ahhh the young ones tend to do this--they will poop and pee wherever they want to. Try moving the litterbox to that corner or put a second one there. Mine are 4 months now and they still poop all over their cage in addition to the box--they pee solely in the litterbox, though. Go figure. Hope that helps!
I agree. Move the food and try putting the litter box in that corner. That's how I got all of ours to use their litter pans--see which area they were using and then putting the pan there.