How to model it correctly in Plaxis?

[SKSA]

I am trying to simulate this model. Can you please guide me if I do any mistake. The initial phase is my steady state seepage condition. The water level at the ground surface initially. Then each step I want to excavate the each layer. I have total seven layer. I want to do fully coupled flow deformation analysis. So, in each step I deactivate the each layer. At the final stage I kept the water level at the bottom level of excavation and followed by the slope. Am I doing anything wrong? The slope is deformed significantly. Where I should correct?