You have already completed the next kata you went to. If you want to do it again, click 'train again', otherwise move on to another kata.

Once I hit the 'submit final' button to finish the challenge, then click 'next kata', it loads the next challenge and gives me the instructions for it, but for the life of me, I can not figure out how to start it. only options I have are 'try again' and 'next kata'.