When listing the item, the seller chose to make the auction private - thus hiding the list of bidders from other ebayers.
It was easier in the old selling format to make your auctions private. Don't know why they changed it! Anyway, to make it private you have to first click on show/hide option at the top of the selling page. A pop up box will appear - somewhere in there, there's an option to add the private auction function. This will add the private option (which you have to select) below the area where you enter the starting price. Select that option, and nobody else will see the list of bidders except you. Hope that makes sense. A little tired..................