Fast Formula not triggered until "Calculate" action in Performance Document

Hi Team,

In the "Overall Summary" section of a performance document, we have developed a Fast Formula that calculates the arithmetic average of the "Goals" summary (calculated as the sum of the ratings given to both core and individual goals divided by the total number of goals) and the "Competencies" summary.

However, we noticed that, before clicking on "Calculate", the "Overall Summary" section uses the standard calculation defined by the performance document. Only after clicking "Calculate" does the section retrieve the value from the Fast Formula.

Do you know how I can resolve this issue?

Thanks in advance!
Vittoria