I saw this on another forum recently. If true, it speaks volumes about eBay security.
A user has just been able to change one of my active listings to there own PayPal so that when a user buys the item they get paid. This was done by literally going on eBay live chat and quoting the item number and eBay username. Nothing else. Then when my item sold and it said payment completed it was sent to an account I didn’t recognise. I can of course cancel the transaction and refund without logging in to the unknown PayPal. However I’d assume the scammer has already moved the money
Another poster said
Someone listed on my account new latest Mac . I didn't see it , as have over 50 items. When people start to bombard me with messages , because it was cheap ( around £1000) I found out and contact ebay. We changed my personal details, but...on my other items I likely spotted on time were different PayPal address, where to make a payment after item sold. Good nothing happened yet , I ended all my listing and relisted with my PayPal email. I am not on social media and don't have Facebook or Twitter or anything like this. So how they do it ?
So you may have bid for a phantom item with payment going to a scammer's account.