My saved data from before is gone what the heck happened

I stopped playing the game for a little while and then i downloaded it today and all of a sudden i got to start from the beginning all over again and i got very far on it too. I don’t understand how this happened I signed into my Facebook just like before the saved data should be there but its not so what happened?

Rj1005 about NBA LIVE Mobile Basketball, v2.1.5