First of all, these deduplication warnings can be a false positive.  The deduplication parameter is the Event ID, and our plugin ALWAYS ads it to each event.  First of all, test your events as explained in this video: WATCH VIDEO If some of your events don’t get deduplicated, try to understand how are those fired, because they are most likely not added using our plugin. Testing on a live website can be tricky. You will see a number of deduplicated server events from your real users, and probably some processed server events too. That’s because the testing tool will not show you events fired in a different browser session, but will show your server events as long as the testing code is used. IMPORTANT: Don’t add events outside the plugin, don’t install the pixel by other means. This is quite common! So, don’t use GTM, don’t add events with Events Manager events tool, don’t enable automatic events inside Events Manager.