From Epic Fab to Keyshot

I downloaded two stone assets from Fab and imported to Keyshot
https://www.fab.com/listings/abe803f0-13f1-4520-bcb9-58cb452ec497


https://www.fab.com/listings/e2ed42b0-c7fd-457c-9c96-09f64e87fc97
Here is the problem



I wonder why this happened and how I can figure this out, thanks