Why does lead go to the cathode in the electrolysis of aqueous lead nitrate using graphite electrodes.?

What does that got to do with the reactivity series......cz in the reactivity series it's above Hydrogen!!, check this link also it shows that it's more reactive.. http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/ions/electrolysisrev2.shtml