A bet resettlement is when the settlement status of your bet (win, loss, void) is modified due to previously being settled incorrectly. This can result in either a debiting of, or crediting to your account. Below are some examples of potential resettlement situations:
DraftKings reserves the right to adjust a payout credited to a player’s balance if the payout has been credited to the account due to an error.
Customers can find more information regarding bet resettlements under section 6.1 in DraftKings General Betting Rules.