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Likely cause: A page reload or client-side navigation quirk is causing the Upstack pixel to fire twice. Common triggers include Shopify’s AJAX cart updates (which some themes handle as full page reloads) and single-page app themes that fire both a popstate event and a full page load. Fix:
  1. Open your store in Chrome → DevTools → Network tab. Filter by upstack or your pixel endpoint.
  2. Navigate to the page where duplicates occur. Watch for two network requests firing for the same event.
  3. If you see two requests:
    • Check if your theme uses AJAX cart functionality — some themes trigger a full page reload after adding to cart, which fires PageView again.
    • Check if you have a custom Upstack initialization script in addition to the app embed — only one should be active.
  4. Go to Online Store → Themes → Customize → App embeds and ensure only the official Upstack Data embed is enabled. Remove any manual <script> tags referencing Upstack from your theme’s layout.liquid or theme.liquid files.
  5. If you’re using a headless or SPA Shopify theme, consult the Shopify integration guide — the pixel should track route changes via the History API, not full page reloads.
Still stuck? Contact support@upstackdata.com with your Pixel ID and a description of the issue. We typically respond within a few hours.