Same thing happened to me twice. When I first got the game I messed around in single player on the island with creative and admin commands, I wanted to play the center so I decided to kill alpha overseer with commands (I had no idea you could use "playercommand Ascend3" So I just fought the bosses and got the artifacts) finally did it, and respawn and I get off for a all while. I come back and all the cool towers and all my tames weren't mine, and had to claim them again and I thought it was normal, so I forced myself into the tribe. Skip to now after I've spent most of the summer on an island server with my friends building up, and going to ragnarok next, we each uploaded our favorite dino for fun to download once we reach lvl 100 on ragnarok. We beat beta overseer, and respawn. None of my shit was there, I got killed by the dinos we left on aggressive, but my friends still had all there characters, i get back on like an hour ago to mess around in my single player Island and again, nothing was mine, and what really ticked me off was when I found I had lost all the dinos I uploaded, if this is a normal bug then why don't they just block off the cave?