This is Anker Customer Service. We noticed that you have contacted our Customer Service to verify whether the charger is the genuine Anker Charger.
According to the picture you provided, it seems that it is our old version wall charger. And according to the serial number on the charger--K4811371, it is our Anker genuine charger.
For the issue that happens on the charger, please try the charger in other outlets to see if it still happens. And please try the charger on a different device and cable.
For your first question, the LED indicator will light when the charger is plugged into the outlet no matter there is a device connected or not.