Beam Moment Vs. beam Stress

I'm wondering about how the beam moment results are calculated, as the results given by the beam moment output dont seem to match the results if I take the stress and back calculate the moment.

Greetings.

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To verify that, I modeled a simple supported beam of length of 10 m. Beam was a rectangular section of 1x1 m.

Further, 10 kN/m uniform load was applied to the beam.

Now, the stresses were observed only due to bending stresses. The stress at top and bottom were -7.5 N/mm2 and 7.5 N/mm2 respectively.

Now, due to this stress, M= Stress * Z  = 0.75 * (1000*1000^2 / 6) = 125 *10 ^ 6 Nmm or 125 kNm.

where, Z = bd^2/6

According to midas software, the moment at centre is 125 kNm itself as shown below.

Hope this explains.

The midas model file is attached for review.