I started a game as Guest on my iPad, and got to level 11. I thought I had logged into Facebook at some point. I later started a game on my iPhone, connected to Facebook, and had to start over, played up to level 2. Then when I went back to my iPad, and connected to Facebook, it rewrote my progress with the progress on my iPhone, back to level 2. How can I get my iPad to write my progress to Facebook instead of overwriting it from Facebook?