Acer E5-575G-55KK is giving slight electric shocks while charging

I just received my new Acer E5-575G-55KK. When I am connecting it to the adapter, the metal body is giving the "tingling effect" of slight electric shocks. What should I do?
Many internet forums have discussed similar matter with other laptops, and most of them held wall outlet as the main culprit, but, my question is why the metal body is carrying this "ground" in the first place? Shouldn't there be any shield to restrict conduction from supply to the body?