解決しました angrybirdsnestHPから

Go to the main menu of Angry Birds Seasons
Clicking the cogwheel from bottom left to open Settings
Tap on the cloud with the X on it. That will remove the cloud content from your device (not the scores).
Go back to the Episode selection screen, and tap on the cloud that is over The Pig Days to download the levels again.

めうめめ about Angry Birds Seasons, v5.3.2