andro55 wrote: Steve,
I can´t reproduce your issue. But I notate that the wrong value is exactly 5× the lenght of the wall.
There may be 5 identical walls in the same place or throughout the plan.
As the length and heights are identical they are being summed together.
Untick the box for 'Show uniform items as a single entry' or add an extra field like an ID that is unique to each wall.
One of the forum moderators. Versions 6.5 to 25 Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10 Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10