Candy crush soda will not update levels on my ipad

I would disconnect from FB in the game on your iPad and reconnect again to see if that gets it syncing again. If you get no joy from that and you have the FB app installed on your iPad I'd make sure you have the latest update for it. You can also try uninstalling the FB app (you wont lose anything don't worry )and tap on connect in the game again. What will happen this time is a web browser will pop up for you to log into your FB account rather than going through the App automatically, it should hopefully bypass the problem to get it reconnected again. Once done you can reinstall the FB app.