If there's a bid placed by accident, you can retract that bid.
From inside your admin area, open the bid history for the item and you will see a red “x” next to it. By clicking the x it will remove that bid.
1) Click "Auctions" on the far left.
2) Click on "Manage Auctions".
3) Click on the Name of your auction.
4) Click on "Items".
5) Click on the Blue Number “Bids”
6) Click the Red x to remove bid.