Something very strange is happening.
The leader assigned to my level 2 Greentop Nursery was somehow reassigned to Spectacle Isle (which I have not even unlocked yet). Now Sim Settlements thinks that Greentop is a new settlement and when reassigning it a leader it gives me the popup to tear it down and start it up as a level 0. All my developed plots are there, but Sim Settlements has lost track of all the progress.
Finch farm was a level 1 and it did the same thing. It reassigned my leader to Nuka world Red Rocket (also which I have not unlocked yet), and when assigning my leader back it thinks that it's also a new settlement and gives me the popup to tear it down.
The leader assigned to my level 2 Greentop Nursery was somehow reassigned to Spectacle Isle (which I have not even unlocked yet). Now Sim Settlements thinks that Greentop is a new settlement and when reassigning it a leader it gives me the popup to tear it down and start it up as a level 0. All my developed plots are there, but Sim Settlements has lost track of all the progress.
Finch farm was a level 1 and it did the same thing. It reassigned my leader to Nuka world Red Rocket (also which I have not unlocked yet), and when assigning my leader back it thinks that it's also a new settlement and gives me the popup to tear it down.