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You have set the sensitivity TOO HIGH.

In Lightning mode, the sensor reading is the change of the light, not the light intensity itself. So when the light does not change, the sensor reading should be very small. Only at the moment of lightning, the sensor valve should increase dramatically and cross the threshold.

You can test lightning mode by covering the light sensor with your hand. Adjust the sensitivity so that the sensor reading is lower than the threshold (small triangle in the middle of the arc). Then move your hand away quickly. The sensor reading should increase dramatically and cross the threshold. Then press the start button to start the Lightning mode. Now only when you move your hand away, your camera will be triggered.