Value of "Change".

Good morning people, I ask you a question: I did this test knowing that it would give me as a result an error to be able to corroborate all the data in the position summary. But the value "change" (in this case -2) how is it calculated? Where does it come from? Is it charged when I open a position and when I close it too, or only when I open it ?

Thank you very much!

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