Hi Jimmy
Yes this has also caught my eye but the scale according to the map-background is correct and if I draw placement fields for modules, the scale is also correct.
I just tried to set the scale to 1:1000 and then the maximum height drops to 17meters which is more reasonable. But the building gets obviously 1000 times smaller and isn't usable anymore. Also, if i try to manually change the the max hight, it just increases it to the maximum value again. I think something is completely broken with these fields in my installation. I think i will try a reinstallation next..