Force Displacement Error

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Hello, I am running an abuse test on a component with a simulated down load as seen in the curve. The load is distributed to a rigid plate by a very stiff spring. Force applied is Negative Z (in direction of gravity). The displacement of component is also expected to be same.    The  displacement of the node to which the load is applied is tracked in the plot.

My Question is, Why does the displacement reduce in between 100ms and 125ms? Theroretically, it should increase as long as force increases. Any ideas what and where I should check in my model?

Thank you!