They may be for sale by businesses who have the correct registration / credit card details registered,  to sell that item.  Or,  from overseas sellers,  where laws can be different.

Or,  they have simply slipped the net, with 7 billion listings on at any one time some invariably some will be missed and eBay do rely on members to report listings too,  there's a report button on every listing, easily missed it's the ? mark bottom right!

Yours was spotted and reported,  unless the message you received,  what is need to relist the item you cannot sell this item on eBay on your account.

@securelypackedpostings