Sending this practice question for you Joey as requested JODY COLLIER

I am getting shocked sitting at my welding table. It's clean I'm grounded well none of my cables are touching. I sit down position myself hit that foot pedal and wham I'm getting tickled where I'm resting my arm. What could be going on? Brad Goodman

4043 practice beads on 3/16 6061. It's what I have to practice on.  Miller #17 torch 2% lanthanated tungsten, furick pro cup #8 balled tip from letting the tungsten do it's thing, 3/8 stick out, 165amps. Feeling pretty happy since this is my first go at this. Thanks to Jody for about 25 hours of watching his videos over and over every night here trying to learn. Any feed back would be welcome. 

New to the page just signed up so that I could learn to Tig with my new miller 180 diversion. Sort of struggling to navigate the page and finding courses to teach me on practice techniques and so forth. Any help would be greatly appreciated.