Wrong procedural building height

I'm using the 2020.3.21f1 version of unity, but the problem also occurs on other versions.

In the screenshots I hope you can understand the problem. When I create the buildings I have the possibility to choose a range for those where the system has no information and therefore does not know the height.
In this case I specified 2-4 as the range.
It's not yet clear to me if it means that he will generate buildings with a maximum of 3 (floor height) x 4 (max range) or 4 maximum units of height.
But in this case it doesn't matter because the result is still wrong.

I tried to generate the buildings both with the "Floow Terrain" option and with " Follow Real World Data", the result doesn't seem to change

The result is that the system writes a number that makes no sense to the building settings and the buildings turn out to be very tall.
Moving them all by hand to lower them is truly an immense and in any case random work.
In many parts the system also generates buildings below the level of the terrain and I don't understand why.

I hope you can help me Alex, thanks a lot

I dug into it, and RWT generates buildings correctly, but... when multiple terrains + Bing Maps elevations it generates heightmaps incorrectly.
I will be debugging this now and as soon as it is fixed I will release a new version.

You have two workarounds:
1. Regenerate all terrains using a different elevation data source.
2. Regenerate all terrains one by one using Bing Maps elevations.

P.S. Thank you for your question. I think this is a critical problem and it will be fixed as soon as possible.