The Wall Selection Settings Dialog shows that the Home Story of the Walls is -1. Story, and their base is 1.780 above the -1. Story level.
The Floor Plane Cutting Plane Dialog shows that your Cutting Plane is at 1100 millimeters above the Story Level. So the base of your Wall is above the Cutting Plane.
Moreover, the Floor Plan Display field of the Wall is set to Projected. This is why it is not visible on that Floor. The Wall is above the Floor Plan Cutting Plane and it is set to display only its Projected part, which means the portion cut by the Floor Plan Cutting Plane and below. But this results in no 2D since the Wall is completely above the Floor Plan Cutting Plane so it doesn't cut it.
If you set the Floor Plan Display field to Projected with Overhead, that should show the Wall with dashed lines (the line type set for Overhead Lines).
Or, the other option is to change the Floor Plan Cutting Plane to, say, 1800 above the Story level so it cuts the Wall. However, that might affect the 2D of other elements, like Windows and Doors (it won't necessarily, but it might).
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