Shader Problems

[frankjrmi]

I'm having problems with Octane shaders. In the scene below, the first image is using typical C4D shaders and the second image is using Octane shaders. If you'll notice, the shadow on the front of the 2-seat couch doesn't blend naturally with the Octane shaders like it does with the typical C4D shaders. The render settings are the exact same in both renders and I've tried massaging the Octane shader, but keep getting the same results. Can anyone tell me what I'm doing wrong?

Typical C4D material

Octane material