When an auction ends with a winner, the winner's credits are not immediately transferred to the seller. Instead, they are held in a pending state by Listia for the protection of both parties.
When the buyer indicates that they've received the item, or when 20 days have passed since the auction ended, the credits will be transferred to the seller.
As your reputation as a seller gets better, the credits from some of your auctions may be immediately transferred to you, bypassing the pending state. Over time, as your reputation continues to improve, the amount of credits that immediately transfer increases.