1/2 height walls telegraphing impression onto ceiling

[Artisan Kitchen]

When I create a room with a pitched roof above, then vault the ceiling by unchecking a checkmark on ceiling over this room, and then proceed to create half-height walls, which then create a room within that room (it's a walk-in kitchen pantry), the shape of the half-height room (the pantry) telegraphs onto the ceiling above. In fact, it makes a depression in the ceiling showing the underside of the asphalt shingles. Makes my rendering look very amateurish and at the least not accurate. Any ideas? I'm using Designer Pro 10.

Thanks,
Dave Boulding
Artisan Kitchens