Nice one.
That looks fairly normal to me, when you say push back, do you mean when the chip is in position and you want to put the load plate on top of it? I don't remember my load plate going right back on all the boards I've had. I guess the board will have come with it attached, so can't you just slip the chip in?
As already said, they do require a bit of force. Check you've lined the CPU up properly too.