(a) If the agency disburses money to an obligor because the agency made an error and mistakenly required the obligor to overpay under a support order enforced by the agency, the agency shall include interest with the disbursement at the rate of six percent a year. The interest accrues from the date the payment at issue was received by the agency, regardless of when the payment is determined to be an overpayment.
(b) The provisions of (a) of this section do not apply to situations where the agency is ordered by a court to return money to an obligor based on the obligor's being the prevailing party in a court action.