You need to remove your Shopify Facebook Pixel and Shopify Conversions API as they will conflict with Pixel Conversions API and result in deduplication problems and unreliable event tracking. Just a few easy steps are needed to do this task. Go into Apps and click on your Facebook App then Follow Step 1 and Step 2 in the first image below and perform the Step 3 if you still have your Facebook Pixel ID on the Preferences Page you must remove it also. See the second image below to remove your Facebook Pixel from the Preferences Page.
(click on image to enlarge)

Step 3 (click on image to enlarge)

This link is for customers that have manually installed their Facebook Pixel Code Snippet directly into their theme.liquid file. https://help.shopify.com/en/manual/promoting-marketing/analyze-marketing/facebook-pixel#change-or-remove-a-facebook-pixel-from-your-online-store
Regards,
James (Tech Support)
Get Pixel Conversions API on the Shopify App Store
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Thanks again from all of us here at Pixel Conversion Pro and remember, you are Awesome!