Value kept adding/subtracting when form is saved even when the input isn't changed

Summary:

Hey All, in our WF module, I have built a form that lets the users adjust the headcount of employees to consider those employees transferring to another department. The script that I built works, but the problem is it keeps subtracting/adding if the user saved the form even if the adjusted headcount didn't change. Is there a function or setting that will prevent this from happening? Please see script on the code snippet

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