Minimaze Mass Analysis with SF

Hello,

I've done a Topology Optimization of a steel node, the material set is Steel S355JR.

Running the analysis with Minimize Mass and SF = 1,05 I would expect a maximum value of no more than 355MPa*1,05= 338 MPa.

The tensions obtained however exceed this value.  1048 MPa.

Someone can help me to understand, please.

Thanks.