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Caculate the boundary force through surface integration of von mises stress

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Hello everyone , just wanna ask a simple question.

The simulation is performed under structual mechanics.

Geometry is a cone, whose top redius is 0.009um, bottom radius is 5um, height is 9um. Material is silicon.

I applied a boundary load of 1e-6N total force (z direction only) on the top of the cone, and a fixed constraint on the bottom.

I run a stationery study. What I expected is that when I do the surface integration of von mises stress, the calculated force should be more or less 1e-6N, but what I get is 5.8e-9N.

Could anyone tell me what the problem is, please? Thanks a lot.

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