After I found the weight model

And display the effect of variables

The result was illogical

In the attached pictures:

Elements 1, 2, 3, 4 and 5 have the same lengths

Elements 7, 8, 9 and 10 have the same lengths

How do two elements have the same length and the same change in the section? Do not they have the same effect on weight?

Thank you for your help in advance

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