I haven’t had a chance to test it so this is the initial occurrence.
All of this occurred between characters on the same account. The item was an attuned shield wall 5% resist.
Character A put 4 items up for auction for 9,000,001. Then, Character A places a bid for the item for 9,000,111 knowing the sale wouldn’t complete because you can’t buy from yourself.
Character B then logged in and placed 4 bids for the item for 9000111. Nothing filled after a minute.
Character A logged back in and nothing had sold. The 9000111 bid on character A was cancelled and immediately the 4 items sold.
There are other variables I’d like to try but I haven’t had the time. If anyone else wants to help me, my global is @0th Power we can set up a time, or just post what you find here.