Products ordered from amazon.com does not necessarily mean they were ordered from Amazon itself. A lot of independent vendors use amazon.com as their storefront. They are still reputable dealers. They are just not Amazon.
Usually they are just small business owners or individuals. When it come to a one-person operation, mistake happen more often than with an automated company.
If it was ordered from one of these vendors, the item could have already been shipped, but the owner forgot to make the update online.