Redundant purchase events: This error appears if your Meta pixel receives four or more purchase events when someone makes a single purchase on your website. This error can lead to over-reporting of purchases and may negatively affect delivery of any ads using Conversion or Product Catalogue Sales objectives. For better reporting and ad optimisation, only add purchase event code to a specific page on your website that indicates someone has completed a purchase, such as a thank you or confirmation page. Otherwise, you can choose to add the purchase event code to a specific inline action. For example, when someone clicks on a Buy Now button.
Click See affected URLs to see which pages of your website may contain duplicate purchase event code. Remove purchase event code snippets from any page of your website that doesn't indicate someone has made a purchase. Also check your website's HTML template header to make sure that it doesn't contain any purchase event code. The only Meta code that belongs in the header of your website is the Meta pixel base code (which contains the page view event).
