My protection stone is gone!!

[lanthus20]

Hey! So i live in underside, it's below seaside and anyways when I logged in today there was a sign at my door that said "this harbor has a new owner plz read message board" and a hole in my house 2x1 (person sized). Then I went in and there was another sign in the house, and when I looked up at my protection stone, it wasn't there! What is happening? Who owns underside now? there were no signs on the message board!