Beats Studio Buzzing while charging my iphone?

My beats work well. However, it buzzed when I connected it to my iphone while charging, as well as my computer that is charging as well. It seemed like I can't get rid off the buzz noise unless I unplug the charger.
Do you guys know about this? Is it normal for all beats studio? Any way to fix? Or it shows that my beats is fake?

Serves you right for buying beats. They are overpriced, and not even very good