Redundant Purchase Events Warning in Facebook (What It Really Means)
From time to time, you may see a red warning message in Facebook Ads Manager that says something like:
“Pixel Error Affecting Delivery”
Redundant Purchase Events detected
This message can look alarming, but in many cases, nothing is actually wrong with your pixel setup.
Why This Warning Appears
When you click “Go to Events Manager”, Facebook may show an issue called:
Redundant Purchase Events
Facebook triggers this warning when:
Multiple Purchase events are detected
From the same user
Within a single session
Across different URLs
This does not automatically mean over-tracking or a broken pixel.
How to Verify if This Is a Real Issue
Step 1: Open Affected URLs
In Events Manager:
Click Diagnostics
Find Redundant Purchase Events
Click Affected URLs
Open each URL in a new browser tab
Step 2: Check the Pages
In many cases, the URLs will be:
Multiple thank_you pages
Each representing a separate transaction
Example:
Initial purchase
Upsell purchase
Downsell purchase
Post-purchase offer
These are legitimate, separate purchases by the same customer.
Common Cause: Upsell Funnel Apps
This warning is expected behavior when using funnel or upsell apps such as:
OCU
Carthook
Other post-purchase upsell tools
Each upsell or downsell correctly fires an additional Purchase event.
👉 Facebook sometimes misinterprets this as duplication, even though it’s valid.
When Everything Is Working Correctly
If:
Each affected URL represents a real transaction
Purchase values match what you see in Shopify
No extra Purchase events are firing on non-purchase pages
✅ Then your pixel is working correctly.
Recommended Action
If the purchases are valid:
Return to Events Manager
Click “Mark as Resolved”
This tells Facebook that the behavior is expected and prevents repeated warnings.
When You Should Investigate Further
Only troubleshoot further if:
Purchase events fire on pages where no purchase happens
The same thank-you page reloads and fires repeatedly
Purchase values are duplicated incorrectly
In those cases, pixel logic or theme scripts may need review.
In this case, the four than-you pages that open show four separate purchases by the same customer. So, everything is working fine and perfectly normal.
Note that this error is expected to show when you're using an upsell funnel app like OCU or Carthook, as in this case any upsell and downsell conversions will trigger additional Purchase events.
Recommended action: Click the "Mark as Resolved" button at the bottom of the message.