What would be causing this concrete blend material to become darker?

[FrankGehry]

I created a blend material for a concrete texture, and I applied a dirt texture to the blend in order to allow some occlusion to occur on the edges (so they appear a bit darker). A weird phenomenon is happening where on two smaller panels of the component, it appears the occlusion is occurring on the entire panel—not just the edges.

Does anyone have any idea what could be causing this? I cannot render this because the result would be so visually jarring.

[Maitken]

Have you tried reversing these faces and re-positioning the texture on the rear face?

[FrankGehry]

Have you tried reversing these faces and re-positioning the texture on the rear face?

No I haven't. For the time being, I just changed the geometry a bit (adjusted the control joints in the concrete) to avoid having those smaller panels. I will dive back into this soon.