Color Ramp Bug???? Confused!

I using a color ramp to control the rust of the model,but the result are different from preview,why?
i find that the color ramp is the main problem


Problem solve,The problem is different sub division level… i am stupid boy…

404 - Not found. Have you provided the right link to the file? Right permissions?

Hey MarcoCheng what is that StudioUI panel that i see in your screenshots? An own custom UI addon?

Yes I made it with python. It helps my workflow. (especially OSL Material Workflow,and group all useful settings in one panel. )