Meshes fly away on simulation

In my project I’m trying to place some meshes in a naturally random way on the ground. But the meshes fly away when starting the simulation. Physics and collision enabled for everyone of them https://youtu.be/ieMkScrrdqM. Where should I be looking for something wrong?
Thanks to anyone who can help me with this.
Greetings from Chile.

Try turning on the player collision view mode. Perhaps your collision for walls or an area is too simple causing the floating objects to be inside of another collision on spawn.

Make sure the physics items are in empty space.

You may need to recalculate the collisions of some objects with the static mesh => Convex decomposition or primitive colliders.