You have been outbid when another buyer has placed a higher maximum bid than yours, and you are not the current high bidder.

Sometimes you'll be outbid as soon as you enter your bid, even though the bid you entered was higher than the current bid shown on the item listing. When this happens, you will usually be notified immediately, and you’ll be given a chance to make another bid.

This happens because another buyer had a higher maximum bid than yours. Your bid prompted Auto Salvage Sale's system to raise the other buyer's bid above yours. The other bidder may have placed their bid hours or days before.