I found extra charges on my credit card bill that was different from what was on the Walmart.ca website and my order confirmation email.
This is what I got from Diana V from Customer service.
We charged you for the correct amount that you should be charged, Andrew. We apologize if the website is giving you different information. There might be a system glitch with Walmart.ca. However, the system that we are using is much reliable and updated than the website.
Diana and her manager Zdin both said what I saw and authorize on the Walmart.ca website does not matter. TRUST is what you earn Walmart.