Thanks for clarifying! There’s something a bit unusual going on in your file, as you can see from this image, the mapped surface has a category #37 mapped to it:
But the right category for walls should be #107:
Can you please try re-mapping each wall (make sure to click “Apply”) and check if the right category number is set?
NOTE: we’re planning to move away from having categories mapped to numbers, that’s a some tech-debt from the past 