You can check the pixel if it was put at the same places by following guide:
First go to your store and check the pixel with Facebook Pixel Helper extension
Then copy the pixel ID
Next Ctrl + U to check the page source
Ctrl + F then paste the pixel ID there
If the page source displays two scripts using the same pixel ID, your store maybe experience the error "The Facebook pixel activated two times".

Please remove one of the places using the same pixel ID to fix this error.
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