Negative scores for objects in some cases

• Hardware Platform (Jetson / GPU):jetson
• DeepStream Version:5.0 ga
• JetPack Version (valid for Jetson only):4.4
• TensorRT Version:7.1

I used peoplenet and nvdcf tracker, and I set 0.7 threshold confidence for person object, but it has one big problem, in some cases, scores of objects have negative, why? I set threshold 0.7.
and I set interval=0 for nvinfer.

Which confidence, I think following comments can explain that, refer https://docs.nvidia.com/metropolis/deepstream/sdk-api/Meta/_NvDsObjectMeta.html

Holds a confidence value for the object, set by the inference component.

confidence will be set to -0.1, if “Group Rectangles” mode of clustering is chosen since the algorithm does not preserve confidence values. Also, for objects found by tracker and not inference component, confidence will be set to -0.1