ZBrushCentral

Zbrush cube help

Hi, i am fairly new to zbrush. I am trying to add details to a simple cube so i create a cube in maya, pressed goz to zbrush. I added the details i want and created a displacement map. Then i notice that the cube has a gradient look to it. I press goz to go back to maya and when i render it, the cube deformed.

Anyone knows why?

Could you show what you mean?