This could be due to the motion detection sensitivity settings. Motion detection sensitivity is the level of difference between the current image and the previous image. Login to your HomeView account and click 'Camera Manager' and then click on 'Motion detection setup'. Here you can adjust the camera motion detection sensitivity.
If you get too many detections move the slider towards larger movements, if you get too few move the slider towards small movements. The best procedure to setup motion sensitivity is having someone walk in front of the camera while adjusting the settings until your feel you are getting the required results.