Low confidence score (~0.3) for clear face images using SCRFD model

I have integrated the SCRFD face detection model into my application. However, I am encountering an issue where the model returns a very low confidence score (~0.3) even when the input image contains a clearly visible and well-defined face.

Details: The input image has: A clear, frontal face Good lighting conditions No significant occlusion Expected [behavior:] The model should return a higher confidence score for such images Actual behavior: The model outputs a confidence score around 0.3, which is unexpectedly low

Could you please help clarify:

What could cause such low confidence scores for clear face images? Are there recommended preprocessing steps or thresholds for optimal results?