You could try checking the game connection. Easiest way is to start the game, disconnect from Facebook, reboot your iPad, then start the game and reconnect to Facebook.
Another option is to re-install the game. However this process will delete any unused boosters and lives in the game. Re-installing the game will most probably solve the issue but I can't recommend it if you have accumulated many boosters.
Thanks again. For some reason, it looks like it’s working now! So far, it has accumulated 99 leaves but I am sure it was more than that or I might have completed this quest already. I am currently on Level 1102 and it does not have leaves so I cannot check for now if it REALLY works. Thank God I don’t have to reinstall the game.