So I've either found a bug, glitch or overlooked something in the manual. Now that I've been playing with the TC settings I notice after altering the temperature or joules and coming out of the menu screen the display shows what appears to me as a random number. Hitting the fire button once displays the correct setting I had previously set it to. As if that field is not refreshing or updating correctly coming out of the menu but then reloading that field once the fire button is pressed.
Strange... Mine doesn't do that at all.. Just goes right back to the display normally upon exit...