Gap between top of 1st floor walls and attic floor. Bay Window problem?

[cocobeach]

Hello,
This is my first post, and I'm very much a beginner, but have spent hours learning the program. I am trying to build a model of our existing home structure. I've noticed a gap in Perspective Full Overview mode between the top of the 1st floor walls and the start of the attic. In addition, above the 1st floor walls, it seems that there's another small wall that starts upwards with different siding than the exterior of the house. I didn't create this small wall, and it seems to force the roof line to start higher, which might be creating the gap.

I've posted a few screenshots of the issue. Another culprit might be the Bay Window, which protrudes above the height of all the other walls in dollhouse view.

Here is the gap between the 1st floor and attic walls:


Here is the exterior of the bay window. No gap on this side of the house?


Here is the bay window in dollhouse view:


I am using Home Designer Pro 2014

Thank you!