Why is GA4 reporting lower sales than Shopify and Klaviyo analytics?

Topic summary

A user switched from a manual GA4 implementation to Shopify’s Google Channel GA4 integration and is now experiencing significant data discrepancies. GA4 reports sales figures more than 25% lower than both Shopify and Klaviyo analytics, raising concerns about GA4’s overall data reliability.

Key Questions:

  • What’s causing this substantial reporting gap?
  • Should they revert to Google Tag Manager and abandon Shopify’s integration?

The user notes that while ad blockers are commonly blamed for tracking discrepancies, this doesn’t explain why the gap is so much larger than what they observed with their previous manual GA4 setup and Klaviyo metrics.

Another participant directed them to an existing Shopify community thread discussing similar GA4 purchase tracking issues, suggesting this may be a broader problem with the integration.

Summarized with AI on November 19. AI used: claude-sonnet-4-5-20250929.

I deleted a previous manual implementation of GA4 and used Shopify’s Google Channel GA4 integration. Problem is that GA4 now reports sales < 25% below that reported by both Shopify and Klaviyo analytics bringing into doubt all GA4 data. I have seen mention that add blockers are the culprit, but that doesn’t jibe with the Klayvio metrics and my previous manual implementation of GA4. Two questions: 1) what gives? 2) is the solution to ditch the Shopify integration and go back to Tag Manager?

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https://community.shopify.com/post/2092034