Basically the listing was nonsense, but we didn't notice it immediately. In our case the flat in Paris was both in the 2nd and 14th androssiment, somehow. It was listed in the 2nd but elsewhere it says 14th.
Of course we went to cancel but there was a 30% fee. We explained it to Expedia customer service and of course they're useless and said the fee was legit and didn't understand the scam.
We took it up with our bank (Chase) who took months to resolve it, we basically kept on getting passed up the chain of people who examine the claims, until we got to a high enough level that they actually understood the scam (after a hour explaining it several times). We were fully refunded our ~$500.
Of course we never will use Expedia again. We generally stick to booking.com because they seem to side with the customer most consistently. Free cancellation, or pay at the hotel is a must. One of the main reasons to avoid AirBnB is that they will keep your money in most cases.