Future Termination changed absence plan enrollment start date

Summary:

An employee was terminated with a future date. Now the Enrollment Start Date of one of the Absence Plans the employee is enrolled in has changed to the date that the termination was entered in the system. Does anyone have any ideas on why is this happening?

I know it's normal for the end date to change to the day of the termination, which it did, but not expected for the start date to change to the day the termination was entered.