There is currently a bug in the game where during a power outage, in rare cases, it can corrupt your S&box data. This is likely what happened to you.
You can fix this error by going to the shop, purchasing a "Plot Reset", and bringing it back to your plot. This will clean and reset your S&box data ( you won’t lose your stored materials, only your plot will be reset ).
If you experience frequent power outages, feel free to contact me on Discord (sousoup_), and I’ll help you set up some backups to prevent this from happening again.
I apologize for the issue, and we’ll be working on a proper fix in the future !