I noticed a similar problem with version 1.2.0.041:
I wanted to create a roof wit 3 layers:
Outside
Gravel
Stone wool
Concrete
Inside
Designbuilder changes it to:
Outside
Asphalt
Fibreboard
Polystirene
Inside
The thickness of the layers in the order remains the same
But if you make a 4-Layers construction like:
Outside
Gravel
PVC-Sheet
Stone Wool
Concrete
Inside
everything works fine
So try to do the same thing in a different way
Hope this helps
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