viscoelasticity modal, curve fitting of prony shear relaxation

i am trying to get prony shear relaxation from shear shear data. There is a trouble. The curve fits well in CURVE FITTING. However, after copying calculated values to property, curve fits badly in PRONY SHEAR RELAXATION. I don't konw why. And when I solve the result, there is no difference between isotropic elastic and viscoelastic solution.

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