I just bought Nokta Simplex. I charged it and updated to the newest firmware. My question is when I hit on a target (coin) it will beep once when the coil first travels over it again when it goes over the middle and then one more time when it exits the coil. So, three beeps on a coin when sweeping in one direction. Is this normal? From the Youtube videos I have watched it only seems to beep once. Thanks!