Partial refund (void) marked as "RETURN"?

We have an order where several payments were made and ultimately the client paid the full invoice. However, the customer somehow overpaid so his last payment was voided. Because of this, the entire order was marked as “RETURN” in the All Sales Report, when it actually was a sale with no return. Is this normal or is this a mistake?

If this is normal then how do we differentiate between a true return and an actual sale with a partial return?