Hi everyone.
This case is some what successfully closed. It was not any MOI behavior but Spaceclaim did it wrong for some reason when importing that object. It all went normal after re-installation.
Thank you for your help and advices.

I also want to thank you Michael for serving your excellent support via PM.
Designu

Hi Mike, you're welcome and I'm glad that your problem is resolved now!

- Michael

SpaceClaim changing imported drawing size

I too had this problem EXCEPT my imports to SpaceClaim from STL were roughly 24x bigger. Just figured it out and wanted to share in case it might help someone else:

>File>SpaceClaim Options>File Options>General -- scroll to "Import Options" then check "Import hidden components and geometry" click "OK"