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> and also turned off all top line on switchboard.
Now you can do "mood" lighting, with standing lamps and table lamps with shades.
> but can't understand how it may broke partially.
Me neither. But consider this: if the switch works fine, then if you turn it off no matter what is the problem in the circuit after the switch (the wiring and the lamp) there should be no electricity there. If there is still electricity, than:
1. the switch is broken
2. the electricity bypasses the switch somehow, the lamp is connected to something before the switch, maybe moisture does that, but if the moisture is only in the ceiling, it can't get electricity there since the switch doesn't allow for electricity to go there (maybe from the neighbour???).