A problem with opening furniture.
When opened the furniture has a different bounding box.
SH3D adjusts X and Y accordingly to keep the base (fixed) part at the correct position.
Not the same with Z.
When the bounding box is changed in the downward direction, the elevation remains the same and as a result the entire window rises.
It happens especially with the turn window when it is used as a roof window.
I have to adjust the window elevation after every opening modification.
Of course the new elevation must be >=0 which is a correct principle.