The system is in equilibrium with zero net force. Since apply force 570N & counterforce 570N.

Why the displacement value is different & the direction also different?

Restraint at leaf spring

Apply 570N

Counter force 570N

Displacement 0.0134mm downward.

and compare below with same constraint but only change the "area" of apply force

Apply force 570N still the same.

displacement 0.052mm upward.