I'll get shouted at for this- just wait and see.
While monitoring the current, rub a plastic comb on your sleeve and approach the pic with it. If the current varies according to the distance of the comb, then you've got a floating input problem. Then you can set about finding out which one it is, a megohm resistor connected to ground is useful for this. then assign it a pullup resistor, or make it an output.
Don't get too close with the comb, if youget a current change youre near enough.