Thank you for reaching out and bringing this to our attention!
I understand that you’re experiencing an issue with Canada Post’s calculated carrier rates, as the shipping rates appear to be the same for 1 or 10 items in your store. It’s important to note that I don’t have access to your store, so I’ll try my best to provide some insight and guidance based on the information that you’ve shared.
If all of your products have weights, then the issue may be related to the shipping profiles or the shipping zones as they determine the rates that appear in the checkout. However, if neither of those are causing the issue, then it looks like we’ll need to access your account in order to resolve this issue. While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to continue assisting you through live chat, email, or callback. Please visit the Shopify Help Center and log in to your account to create a support request.
I’d love to know whether the issue is due to the shipping profiles or the shipping zones, or if our Support team can help you identify and resolve the issue. I’d also love to hear more about your business! What kinds of products are you selling?