The same reason the hottest part of the day isn’t noon, but around 3pm. The temperature keeps rising so long as the incoming heat is higher than the outgoing heat. There hasn’t been enough time for the temperature to reach an equilibrium.
Lets say you have a pot of cold water, normally it takes 5 minutes to boil on high heat. If you heat it on high for 2 minutes, then turn the heat down to 75%, it’s still going to keep getting hotter, despite the rate of heat input going down.
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