Watch the Generation live data and Consumption live data for a couple of minutes. If you see that when the Generation figure increases the Consumption figure increases by a similar amount and visa versa then you need to reverse the direction the cable is going through the Grid Sensor.
1) Locate the Grid Sensor (should be clamped to the live cable between your Electricity Meter and your Consumer Unit / Distribution Panel).
2) Look whether the OWL logo is facing towards the Meter or towards the Consumer Unit.
3) Undo the Sensor latch, remove, twist 180 degrees and re-attach.
4) Check that the OWL logo on the Sensor is now facing in the opposite direction to that in Step 2.
When correctly fitted your Consumption figure should not move up and down in sync with the Generation figure.