When the sales order price will change after shipment?

Hello engineer, we occasionally encounter that after the RMA order received, the order price changes, and the order price recaptures the price of the sales price list，Even if we have selected the order calculate price flag as Freeze Price when creating the order.Freeze the price, the sale order price should not be in the fetch price list.

We usually create a return order by copying the sales order, confirm that the price is

correct, and then modify calculate price flag as Freeze Price, and then book order.But sometime after the RMA order received, the order price changes, no body has updated sale order,after booked.