Problem with Probabilistic Damage Analysis - Maxsurf

Hi,

This is my last year in university, I am a naval architecture student and currently working on project about how the width of the Ro-ro ship's void compartment affect their probabilistic damage (Attained index) using Maxsurf.
As far as i know, the dimension of the compartment and tank affect the number of Attained index. But the problem occured when i did the analysis of a ship with two different width of compartment, the result of Attained index remains the same.
I have attached some images of my compartmentation, loadcase and damage analysis settings. Do i missed something?

Thanks

                    All the three drafts result same A number

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