Why is my progress not synchronised between two devices?
All your progress and scores will be synchronised. However, at the moment, the workouts will be different on different devices - we're working on that.
If your high scores and history are not synchronised at all between devices, you have logged in with two different accounts. In that case, log out of Peak on the device that doesn't match your original account, and login again with the e-mail address you used to register originally.