You can see my answer here for an explanation of what the critical power model is, and you should also be able to see why it is that if you did a fresh short duration effort, your zMAP estimate would increase but your zFTP estimate would decrease.
You can see my answer here for an explanation of what the critical power model is, and you should also be able to see why it is that if you did a fresh short duration effort, your zMAP estimate would increase but your zFTP estimate would decrease.