If your league is not syncing, please check the Edit All My Leagues screen on the Draft Dominator as your host account may need re-authenticating. If that's the case, you won't be able to miss it - they'll be a red box next to it with a button to re-enter your credentials.
If you have issues with this process, please delete the whole host account using the red X to the right of the login name, and re-add it from this same screen.