IF I understand you correctly, you are wondering why the metal plate doesn't just drop down nicely? It shoudnt, you will need to apply a relatively large amount of force to get it to close. The point is for it to really squeeze and hold your cpu in place.
Just be 100% sure your cpu is placed in the socket properly.
watch:https://www.youtube.com/watch?v=VNLrfpzSWAY