Different axle weight in toyota Axio 2008

While I was testing a 'reconditioned' toyota Axio 2008 imported from Japan, the report showed the weight on the rear left axle is 398kg and on the rear right its only 360kg (fronts are both 570kg). They put the car on some kind of vibrator while someone was sitting inside a car. The petrol tank is on the left if that helps. The engineer said its okay but he sounded a bit dodgy.

Could someone explain this to me plz ? Does this car has any problem on the rear suspension sys?

Many thanks.

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