I do a curve fit for visco-elastic material using the Shear Data (Shear Modulus-Time) for 3 different temperatures [Fig 1].

After I 'Solve Curve Fit', I get the Prony Shear data (Relative Moduli and Relaxation Time) so I 'Copy Calculated Values To The Property'. The graph in the curve fit seems to match the points.

But these Prony Shear Data generated by the curve fit seems kind of strange [Fig 2] (strange because Prony shear parameters usually follow a trend (as far as I know), for example, time is decreasing).

Moreover, for this case, I have additionally the Prony Series, but the values seem to be very different [Fig 3].

Any suggestions?

How much should I trust ANSYS curve fit?