Procedure list step gets time and date stamped with the person doing the specific step

We have a shared procedure list for onboarding new staff - 2 different people work on it. When person number 2 marks a step complete, it changes all the other action steps to person 2 so the time and date person 1 performed a step is lost. For auditing purposes on account creation and deletion, it is helpful to keep the original time and date stamp for each person completing the step.