It was just a website error- they sent an apology out after saying no orders were actually cancelled. Here's what they sent me.

Dear William,

Thank you for your recent Walmart.com order(s).

In checking your My Account order history for the order(s) below, you may have noticed that one or more items show a status of cancelled but you did not receive a cancellation email for this item(s). Please disregard the status as it is an error. (If you received a cancellation email for an item, then that item has in fact been cancelled.)

The incorrect cancelled status on your My Account was caused by a system issue that has since been resolved and your item(s) are currently processing and will ship as expected. You will receive a ship confirmation with a tracking number for these items in the next few days and the status on your My Account page will be updated to shipped.

We apologize for any inconvenience this has caused, and wanted to assure you that your products are in fact being shipped.