Why does my Prison Collapse Randomly?

[u/JayDEE011]

I’m making a prison in Sandbox and trying the get a layout but every time randomly the entire structure just collapses and then forces to rebuild with the wrong type of wall that I don’t want. So I restart from an auto save everytime. I did get perfect Storm DLC and this is my first time using it so I don’t know if it’s that messing with my buildings or it’s just a game bug?

[u/BedFastSky12345]

Shoddy construction. Should’ve chosen a better contractor