Facebook accounts and guest accounts are not synced because of differences between them. You may keep playing from your Facebook account by signing back in if you don't want to start over from scratch.
You can log out of Facebook and continue playing with your progress if you were using a guest account.
Remember that just the data on your device is stored for guest accounts. You will lose your guest account if you switch devices or format your current one. Use your Facebook account, as we recommend.