Reached total force Fz not realistic

As shown in the figure, the hollow cylinder, with a wall thickness of 0.4 m, is placed in the soil, and the prescribed displacement in the z direction is applied to its bottom to be +0.001 m. The resultant force Fz should be positive, but the result is negative. Why is this ?Is it because the bottom node of the cylinder is shared with the soil? Can I solve this problem by adding an interface at the bottom?

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