It might be a glitch, or it's possible the seller and/or the item have been removed by ebay for some breach of policy. You could try searching for the seller using advanced search and see if any other of their listings come up. But you may have to just wait and see if you receive the item.
If you don't get it open a "not received" case after the estimated delivery date to get a refund. If that is not possible (may not be if seller has been suspended by ebay) contact your payment provider and ask them to help.
@thesaintscar
