My fractured mesh is flying immidiately when i hit play button.

First of all sorry for my english.
I have a problem. I have premade meshes and with some of them is problem. When i fracture them everythin is working but when i hit play button to test it out my meshes strats to fly and then destroy themself upon impact with the landscape. I tried many things but nothing helped me. Do you have knowledge what is wrong with it?
Thank you all

Hello and welcome to the community.

Without a relevant screenshot, I am only able to provide a limited reply. Feel free to provide images or anything that will allow us to see your level.

Previously I have spoken with another user about Anchor Fields which are very useful in stabilizing sections of your Geometry Collection.

A few other questions to keep in mind:
Is the Geometry Collection snapped to the floor?
Are there any other colliders present in the level?

I hope the post I have linked you provides assistance.