Stone blocks appear on the protected area

[amadin]

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:

[lag01]

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

[amadin]

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?

[Dragonop]

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...

[est31]

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?