In one month my Manpower dropped from 10,191 to 9,204, but the hover says I am gaining 813 each month. All of my armies were fully replenished several months before when I had around 15k Manpower.
Am I misreading the hover information? Is there another screen that shows more details or what is causing the drop?
Update: I am above the force-limit (76/72), but the only penalty mentioned in the hover is a monetary cost of 1.43/month. Is this related?