OK - explain - for example - listing an item for a friend - the A&C Islands - zero - zilch - nihil - population.

His friend is a bird?  😃

Not really - that was actually a general comment, explaining why the item location might be different to the seller's actual address, not specifically related to the (very unusual) location showing on the OP's listing.

Thanks for this, but in my sender details it shows Australia plus

the correct postcode, rather than the Ashmore and Cartier Islands

address.  I spent 45 minutes on Chat, without any resolution.  The

person didn't seem to be able to comprehend exactly what my

problem was, and just kept repeating irrelevant questions!

try again and demand a supervisor......or go to their facebook page & complain there.....apparently people have more success when everyone can see the complaint??

It's not rocket science.

Seller address is independent of location. That is why Chinese sellers can list item location in Australia when they are unlikely to have stock in Australia. You seem to have A&C as your location. Change it. Individually or in bulk for your extant listings. In the item location field of your listings.

Did you try editing the item location?

It appears not. After all, why spend a few seconds making sure your ONE listing is accurate, rather than wasting several hours of eBay and members time trying to help you.