Topic summary
Main issue: Duplicate Facebook Pixel events (AddToCart and Purchase firing twice) on a Shopify store despite only one pixel visible in theme.liquid and Facebook settings.
Key details and actions:
- Google Tag Manager (GTM) is installed. Removing the Facebook-related tag in GTM initially stopped the duplicate events. A responder noted GTM is a common overlooked source.
- Behavior differed by browser. The store owner also added a purchase script in Checkout and asked if it should be removed to prevent duplication.
- A yellow exclamation in the Facebook Pixel Helper was traced to an ad blocker; disabling it made the warning disappear.
- Multiple screenshots from Facebook Pixel Helper were shared to illustrate the issue and warnings.
Current status:
- The duplication appeared to resolve after GTM changes but then seemed to return without further changes. The root cause of the recurrence remains unclear.
- Open questions: whether the checkout purchase script is causing a second event, and why duplication reappears intermittently across browsers.
Notes:
- Facebook Pixel = Facebook’s tracking code for events/conversions; Pixel Helper = browser tool for debugging pixels; GTM = Google Tag Manager for injecting tracking scripts.
- No final resolution yet; investigation ongoing.
