Weird renders. HELP

[Snoopy]

Hello, I created an object and replaced all the similar shapes with instances
but the instances look weird.
I checked the normals of the original, also if there are unnecesary vertices, edges, etc but couldn't find any errors with the original mesh.
The original object renders fine.
Then I thought I need to triangulate the original mesh but still the same problem.
"Any" suggestion would be greatly appreciated, I have spent many hours with this problem

Thanks a lot in advance!!!
Snoopy

[Snoopy]

Here's the object:

[Snoopy]

Here's the obj that renders weird at different angles:

[Snoopy]

I created a new scene and loaded the object by itself and still get these weird lines,
they dissapear in some camera angles.

[Snoopy]

Here's the scene

[Snoopy]

I just noticed that if I remove the "Smooth" Option in the Octane Texture TAB, then it looks ok.
Why is that?
Is that normal?