Density in Amorphous Builder

Dear all,

I have a question concerning the Amorphous Cell module. When I try to construct an amorphous cell containing the molecules in their desired molecular ratio and denote the density I observe that the density does not scale linearly with the number of molecules. What does the density in the Amorphous Cell express? Is it not the density of the mixture you are trying to create? How can I recreate the experimental density of my substance? Thank you very much in advance.

Kind regards,
Andreas Gavrielides