»The server is deleting our buildings

The map is getting back in time. I did a railway station and today, between 6 PM and 7 PM part of it disappeared. It turned into stone BUT it also has ores and so one. I, unfortunately, don't have screenshots of it before, but there's one more thing. On 13.07.2018 with a friend we did a tunnel in the mine, and also today, between 5 PM - 6 PM it disappeared. This time I have screenshots before and after.

before:


after, today:


just realized that the stairs also did disappear. Take a look.

before:

now:



my nick in game is bkaczmarczyk. pls, help me, I and my friend don't want to lose our house etc.

 

Sorry for the inconvenience.
An urgent rollback was needed, we apologize for you losing the railway.
If you need any more help, contact us once more.
Thanks!
Pika, locked.