According to your settings, I can't see any reason why the lamp should now be on for 24hours only if you added a second simu stick.
So are both lamps permanently on or only one of them?
Are you still able to dim the lamps manually via the menu point light scenarios? You would have to shift the bar no. 4 since you have programmed illumination 4 for the sticks.
Or if you connect one plug of the driver to L1L2 and assign the function illumination 4 to L1 and L2 - is there any difference then?