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Likely cause: A Shopify theme conflict — custom JavaScript on your theme is throwing an error that interrupts the Upstack pixel before it finishes loading. Fix:
  1. Open your store in Chrome and press F12 to open DevTools → Console tab.
  2. Navigate through your store and look for red JavaScript errors. Common culprits include Uncaught TypeError or $ is not defined errors from other apps or custom code.
  3. If errors appear on the same pages where events are missing, the offending script is blocking Upstack’s execution.
  4. Try temporarily disabling other third-party Shopify apps one at a time (via App embeds) to isolate the conflict.
  5. Once identified, contact that app’s support or move the conflicting script to load asynchronously.
Still stuck? Contact support@upstackdata.com with your Pixel ID and a description of the issue. We typically respond within a few hours.