Stamp tool is doing opposite

Hello I am using the stamp tool according to the directions, and it is removing my terrain except for what is under the house. How do I fix this?

Thanks

Can you upload your .skp file to show us what you are seeing?

terrain test.skp (10.1 MB)

First, why is your model so far from the origin?
Screenshot - 5_5_2020 , 7_32_48 PM

I moved it to a reasonable distance exploded the terrain group.

Thank you for your help. I sent you a copy of the model with the portion in question, there are a number of reasons why it is so far from origin that I won’t get into here.

It sounds like the answer to my question is that I had to explode the terrain in order to be able to manipulate it. Is this correct?

Thanks