Why isn't Amazon OneLink redirecting correctly from my product page?

Amazon OneLink works from my homepage, but does not work from the product page. Here is the background and issue:

  • I have Amazon OneLink code installed on the footer of theme.liquid

  • I have my US and CA Amazon affiliates linked

  • I am using a US marketplace affiliate link (http://amzn.to/2M3DGDc)

  • I am in Canada

On my homepage (MyTastefulSpace.com), click any of the slider images and it correctly re-directs to the CA Amazon marketplace.

On the product page (https://mytastefulspace.com/collections/amazon-affiliate-products/products/ivolador-crystal-glass-te…), click the test link and it goes to the US marketplace.

On each page, right click and copy the link address, you will see they are both the same (http://amzn.to/2M3DGDc). But the home page redirects to CA marketplace and product page goes to US marketplace.

What is taking place behind the scenes on the product page that I am unaware of that is preventing Amazon OneLink re-direction to the correct marketplace?

Where can I find the answer to this question?