The new auto-matching feature in Facebook can lead to reporting overages if it is enabled without carefully checking what it does.
When you see a strange symbol like this in pixel helper, that is a conversion event that is tracked by auto-matching:
Here are step-by-step screen shot instructions for disabling this feature in Facebook:
In the Trackify Pixel Engine page click on the Events Manager link.
In the Events Manager, click on Settings and scroll down to the "Event Setup":
Make sure the switch under "Track Events Automatically Without Code" is set to OFF!
You have completed this tutorial.