Maybe the type of zapper you are using just does that, huh. Mine doesn't do that at all. The only thing mine does is get me fealing better. No burning ( in the whole two+ years I've had it) and almost no sensation... I can remember once when I thought maybe it was tingling, but it was a very, very small ammount of tingling for just a few seconds and that might have just been my hand falling asleap. I'm not sure if it's safe to use a zapper like that, but if your sure and it does work I guess that's that. I'm going to stick to mine.