Why is the total energy dropping so drastically ? It should remain constatn

Hello Everyone,

I am performing a crash of simple component on the rigid wall. I want to understand the basics of the Energy Curves. When I plot the curves of the energies. It is seen that the Total Energy is dropping significantly, as per my knowledge the energy should stay constant or change negligible. The energy error and mass error are in acceptable range. Can anyone help me understand this. I have attached the model and following are the energy curves.