FOSS gamedev and creative worlds

Stone blocks appear on the protected area and move protectors and other blocks. Server 0.4.12-dev, leveldb, i don't know when did it happen (i shutdown server for update versions of mods with command in chat /shutdown as usual), but after shutdown and running again i came to server first 8 hours and see this:

Is your server public? Maybe it has something like pistons from mesecons mod?
Some griefers are really resourceful and can do wonders.

lag01 wrote:Is your server public? Maybe it has something like pistons from mesecons mod?
Some griefers are really resourceful and can do wonders.

Yes public. But i think this stone blocks can put only player with creativ inventory because it is not cobblestone, does mesecons mod can create stone?

amadin wrote:

lag01 wrote:Is your server public? Maybe it has something like pistons from mesecons mod?
Some griefers are really resourceful and can do wonders.

Yes public. But i think this stone blocks can put only player with creativ inventory because it is not cobblestone, does mesecons mod can create stone?

If you cook cobblestone you get default stone...

It is a known trick to push protection blocks away with pistons, and then grief areas. You have the mesecons mod on your server, right?