IF your item you bought was from another seller on Amazon, this happens.
I have had it happen and I only buy on Amazon when they are the seller and it comes from their warehouse.
I have gotten refunds before from these people burt when you pick one of those items you lose the easy refund terms with Amazon.
I am mobility handicapped, so Amazon is a Godsend for me.
I have found, though, that Chinese third-party sellers game the system horribly. Including falsely representing that their item is stocked/sold by Amazon itself.
A work colleague who spent 4 years in China reported that the Chinese don't even have a word for ethics.
I've had a China vendor falsely report an item as shipped within minutes of entering the order, preventing me from cancelling when I find out that the item won't actually be delivered for a month.
I used to shop on Walmart, but their web site update is only compatible with smartphones, so it doesn't work on my laptop anymore. Ditto Chewy.