Issue with residential electrical system in Brazil
Well, it isn't unusual for neutral current flow to differ from hot current flow, when the circuit is a multi-wire branch circuit.  

Brazil uses a compromise voltage of 127V hot-neutral and 220V hot-hot.  This lets them be compatible with USA's 120V hot-neutral and 240V hot-hot (within 8% anyway, which is fine). This allows them to deliver 3-phase power to the house. (127 x sqrt(3) = 220). 

So on a Brazilian multi-wire branch circuit, there may be up to 3 hots sharing the neutral.  Activity on the other hots would account for the differing current.