The scratchpad column as you see it in the XML view of your homenode is not actually used anywhere now. If you update your new scratchpad, the scratchpad data in the 'users' database table is not updated. As for why the old scratchpad's contents still show up in the XML view, it's because that part just hasn't been changed yet. I'm pretty sure you'll see that disappear soon enough, since (from what I understand) the major reason for the switch to the new system was to get rid of this bulky scratchpad column in the database.