To repeat what is in the posted link above:
This is an issue with Shopify's Google Shopping Channel: When the Shopify App uploads the product feed to Google Merchant Center, it appends the following UTM tags to the product url:
You can confirm this by going to your Merchant Center > Products > All Products > and click on one of your products that was uploaded via the API. Look at the product url / link and you will see the utm tags in there.
To remove the UTM tags using Feed Rules:
Hope that helps!
The paid & organic report (available for Google Ads engine accounts only) shows the search terms that either triggered your ads to appear on Google, triggered Google to display unpaid (organic) search results for your site, or both. This information helps you understand how paid and organic search work together to reach people searching online.
To add a big more to this topic:
After digging into it some more, I've come to these additional conclusions:
If you use tracking parameters in your link attributes, it is recommend that you use the canonical_link attribute to provide a canonical URL. Use the canonical_link attribute to ensure that products are associated with the correct URL in the Google Search index.