Facebook - API Conversion & Pixel - Duplication Issue

Question

I have implemented Conversion API along with Pixel, for the same Pixel ID. They both seem to be firing correctly and test data is coming in for both Server and Browser.

I have added EventID & Event_ID to both Pixel and API, respectively. Both ID's are coming through correctly. However, facebook does not recognise that it is a duplicate entry.

I am wondering what the issue is, as I note the Pixel EventID is not appearing in the column, but looks okay under Paramater.

Any help much appreciated.

Here is the Image showing test data in FB

Here is the code on my Pixel

fbq('track', 'PageView', {eventID: '{{Event Id}}'});