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Hi Eiji, have you been playing through Facebook the entire time? If so then Facebook saves your progress. If you only started Facebook recently then your levels were not saved.
Please note that the boosters are saved to your device and not the game data, so you can use them when offline too. This does mean that any updates, crashes or device changes can cause these items to be lost. For this reason, we do not recommend storing too many of the won boosters as these can indeed be lost unlike Gold Bars.
Now if you were playing all along through Facebook then clear out the history on your mobile device. Then log out of Facebook and log back in and it should bring you back to your current level.