Same thing happened to me on the March 11th Sky sailing. All of my reservations in Cielo were gone, but my specialty dining was still there. So I rebooked all of those dates in Soleil. Was able to get the same time.
Now seeing the link for the web based site, I now find I have two reservations for all of those nights. Go figure....I didn't know they would let you do that. So now I am afraid I will lose both of them if they discover this. Will probably cancel out of one of the dining rooms.