Adybug Radiation Analysis Issue - Discrepancy Between Roof and Pitch

I am currently working on a stadium model in Bowlbuilder, where I used the Loft command to create the roof and facade, and the Box command to create the pitch on the ground.

During my annual radiation analysis, I noticed something unusual: at certain times, the roof radiation results are showing as 0 or very close to 0, while the pitch radiation is significantly higher. Logically, since the pitch is beneath the roof, I would expect the roof radiation to be greater than that of the pitch due to the shading effect.

Has anyone encountered a similar issue? If so, I would greatly appreciate any insights or suggestions on how to resolve this discrepancy in the radiation analysis results.

Thank you for your help!

Best regards,