Skip to main content
There are a few possible causes of duplicate pixel events in Shopify. Here are the most common:

​
Multiple tracking codes installed

If you have multiple tracking codes installed on your website or in your Shopify theme, this can cause duplicate pixel events. Make sure you only have one instance of each tracking code installed.

​
Tag firing multiple times

If your tag fires multiple times on a page (for example, because it’s embedded in multiple elements), this can also cause duplicates. Use a tag manager like Google Tag Manager to make sure your tags fire only once per page.

​
Page refreshes or multiple clicks

If a user refreshes the page or clicks the same button or link multiple times, the pixel event can fire more than once. Add guard logic so the event only fires once per user action.

​
Custom code or apps

Custom code or third-party apps installed on your Shopify store can interfere with your pixel tracking and cause duplicate events. Review anything that injects scripts into your theme.

​
How to prevent duplicate events

  • Make sure you only have one instance of each tracking code installed.
  • Use a tag manager to manage your tags and ensure they fire only once per page.
  • Prevent duplicate events from firing on page refreshes or repeated clicks.
  • Review custom code and third-party apps for interference.

​
Where to go next

For the Upstack-specific diagnosis (including event_id deduplication and the classic native-app-plus-pixel overlap), see Duplicate purchases and How to troubleshoot your pixel.
Still stuck? Contact support@upstackdata.com with your Pixel ID and a description of the issue. We typically respond within a few hours.