Is it possible for motion to be affected by some devices in my home?

The motion detection of your sensor is based on infrared technology; if extreme fluctuations in temperature take place within motion´s field of view, an incorrect triggering is possible. This might lead to faulty notifications of movement, even if nobody is at home.

You should make sure that there are neither heat sources like radiators or strong lamps, nor large reflecting surfaces in your sensor´s field of view.