What are the steps to this glitch please, to help other Buyers avoid it?
 
And have you reported this directly to eBay so the Techies can fix it? 
Selling Hub > ? icon > Report a Technical Problem
 
Last but not least, depending on the reason for the return you may be able to recover your money by going directly to your payment provider. Buyers have a legal right to pursue a chargeback for 60 days, but many banks extend this to 120 days.