I have a new furnace working and a new humidifier turned off and I notice some water leaking from the return air pipe and the maintenance guy told me that it's not the furnace problem but it's mine to find from where is coming the dirty (brow) water leaking from above the humidifier.
And in the room just on top the furnace my hardwood is bending and the color is changing that's means that the brown color was a color of my hardwood and with the condensation of the humidifier I have this done like that... please advice with a solution to use it and avoid that again. :)

Have the humidifier checked for proper install. We cannot check it from here it has to be done on site. You need to find the exact source of the water leak and repair.