I just stumbled across this post in my search for help on another issue. The value in my data layer says “shopify_US_{{product.id}}{{product.selected_or_first_available_variant}}" but it should be "shopify_DK{{product.id}}_{{product.selected_or_first_available_variant}}” instead - so DK instead if US - as that is the value submitted through the feed. Do you know what can cause this? All language and currency settings in Shopify is set to Denmark, so it should be getting the “Shopify_DK”-value.
I created this ticket in the technical foums. Perhaps you can help?
https://community.shopify.com/c/technical-q-a/incorrect-product-id-in-data-layer/m-p/1797832#M109118