calculation of calories in a recipe after cooking?

I translate :)
I have saved many recipes in my Account, only I am not sure I understand one thing. When I enter my muffin recipe for example the total weight of my recipe is higher raw than after baking since I can make 10 muffins so I put 10 portions and when I weigh my cooked muffins their corresponding not corresponding to the weight of serving. .. (they are lighter)
should you count while serving anyway or should you enter the weight in grams of the cooked muffin? how are the calories of a cooked recipe processed?
I do not know if I am very clear in my question but I hope someone can enlighten me

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