This is a new feature eBay introduced when accepting / making an offer a method of payment is being asked, and immedate payment required.
To be fair, no seller was told of this previously, and all opted in some do not even know they have this option selected, and only a seller can deselect it.
It's brought in to stop all the non payments when offers were accepted, however it has its failings, like no choice of other methods of payment, combined postage cannot be offered nor Click and Collect.
