How can a garnishment deduction be taken if it's not set up for the employee?

Employee has only 1 garnishment set up for a Tax Levy in North Carolina. Set up was completed on 6/8. We pay semi-monthly. And a garnishment deduction was taken on the 6/15 paycheck which it should not have been taken. On the 6/30 paycheck, the 6/15 deduction was refunded. After Payroll confirmed it was noticed the employee had a garnishment deduction for an additional garnishment which he is not set up for.  It’s for child support in Washington state.  Any thoughts as to how this could happen?

We are on PUM44 and PeopleTools 8.59.