Need help understanding ingame physics

So the issue I am running into is that when I build a wall of blocks/boxes as in I stack one on another the way they were built a long time ago the physics pulls them down the z axis every time. When the wall is pretty small its all nice and dandy, but as soon as it gets taller everything goes to ****. I am doing this with destructible, but even if they aren’t destructible and just normal static meshes they still fall over. Any help would be amazing at this point since I am getting way too frustrated with it right now :smiley: