I think she knew how to cancel because she cancelled her counter offer before she made another offer. I think the second bidder might have been her mother's account. I wondered if maybe she made the second offer because she wasn't sure if I saw the first one. Some people make offers before I wake up in the morning, then they get nervous because I'm not responding. They don't realize I'm in a different time zone.It could also be an honest mistake. I have two accounts, one that has my husband’s credit card as the default for smaller purchases, and one that has my own credit card as the default for more costly items. The app is set to the one with my husband’s credit card so that’s what I use for browsing and sometimes I accidentally make an offer using the wrong account. Then I have to switch to the desktop site where my own credit card is the default and make an offer with my real account. I know you can cancel an offer, but maybe the buyer didn’t know.