The position of the belt on the tensioner and crank pulley looks correct from what i can make out. Mine sat exactly the same way on the rb25 when i swapped the belt.
Silly question, but which way have you installed the plate that sits infront of the crank pulley, curving away from the belt? As it really only acts as a guide to make sure the belt doesn't slip forward and so i assumed it should be a pretty close fit.