Meter reading is not equal to the actual consumption calculated from the wattage of the equipments
Possible reasons:

The ratings on the appliances are wrong or optimistic.
The meter is not accurate at low ranges. (You have posted no information on the meter so we don't know what its full scale reading is and what accuracy and precision it can give.)
You are running the appliances at a voltage other than their ratings. This will cause the power to deviate from specifications.
You have additional load somewhere that you have not taken into account. (What is the reading when you switch off the four appliances?)