Dissapear all materials for building

[azaharov]

When we start to build, we put some materials to sign. While our builder run to crate to pick rest of materials, sign just dissapear.
Nobody can take it, because we have walls around.
Situations like this happen two times for last 3 days.
At first time dissapear just one board.
At second - dissapear bricks, iron bars, nails.

[Droj]

if it's not built on a claim then it can decay.

[azaharov]

if it's not built on a claim then it can decay.

I see. Thanks