Electric shock from metalic light switch button

xpen15

Newbie
Hi, I have black nickel light switches in my living room. its got two switches, one to control spot lights and another for a center light light. A couple of days ago my son and I got an electric shock whilst the switch was in the ON position. I tested the face plate with a Neon screw driver tester and ONLY the switch in the ON position was showing a Live. The surrounding face plate and the screws were fine. The Metal back box is earthed i.e. one of the cables has an earth wire which is screwed into the back box and from there another earth wire is screwed into the back of the switch plate. I have no issues on any other similar Light switch on the same floor. Is this a faulty switch?
 
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