Electric Window not working - Megane Cabriolet

Hi, there are two controls for elec windows in a megane cabrio, one main button takes down all the windows and then a separate button as norm for each window. When the main button is pressed 3 windows only roll down, and the remaining one can be operated from its own button therefore the motor is working etc, would anynow what's the issue here and if its something small to fix the main switch that is only operating 3 of the 4 windows?
Thanks.

Wrong forum.

I'd post this thread in the Cars and Motoring forum if I was you.