Importing model from zbrush cause some issue in 3ds max

I have created cube model in z-brush then I exported it to .obj format. Seems vertex count is the same as in 3ds max as in z-brush.

In all my viewports I see cube, but in perspective I see not a cube but some like "extra shadows" on the each side of cube, like cube has not plane sides.

When I render it it also has not plane sides and some ugly shadows. How can I fix it, maybe I should know some tricks about it.