SEN0626 - Face Detection model inaccurate

I tested the example code at https://wiki.dfrobot.com/SKU_SEN0626_Gesture_and_Face_Detection_Module. When I turned my back to the camera, the function “gfd.getFaceNumber()” reports my back as a face. Someone has this module, please verify it independently.
Does it support OpenCV and Haarcascade model? For face detection and face counting projects like this, https://www.theengineeringprojects.com/2025/03/esp32-cam-based-real-time-face-detection-and-counting-system.html
I use OpenCV and Haarcascade. I also use YOLO sometimes for person detection. All these libraries and models are compatible with the ESP32-CAM.

The function “gfd.getFaceNumber() seems like a head & shoulder detect, not face. Sadly, face detection is the only function I need from this module. There is almost no support from DFRobot. I need to explore alternative solutions.
