I do'nt understand what the problem is?

Is it the roughness in the side of pentagrams extrusion?

If so:

A.)  I can see in roughness in edges the B/W DIssplacement Map.  BTW what resolution are the two maps you're using...

B.) What the Maximum Texture Size is set to, in your Render Settings.  This happened to me for the longest time, even after I'd switched to 4048 x 4048 pixels textures.  Thank goodness Ockham reminded me of the Max. Texture SIze setting, and low and behold I must have bumped it, becasue it was set at 1024!

=  )