ZBrushCentral

Zbrush to Keyshot material issue

Hi guys
Everytime I send my model from Zbrush to Keyshot, all the materials I’ve previously assigned to the subtools in Keyshot gets messed up. All materials on the subtools in Keyshot would randomly all switch to 1 single material or a few random materials. My subtool names were not changed or anything, so I’m not sure why the materials would reset everytime I send it over.
Any ideas why this would happen? I’ve been wasting so much time reassigning the materials everytime I update the model over.

thanks much in advance!