Hi @RikLawliet
Welcome to the DeGirum community. Thank you for providing such detailed information on your problem.
If you compiled the yolov8n model by yourselves, it is likely that the hef file uses Hailo’s in-built NMS which needs a different type of postprocessor. You can see how to integrate such models in our guide: Hailo guide 3: Simplifying object detection on a Hailo device using DeGirum PySDK. Briefly, what you need to do is to replace DetectionYOLOV8 with another postprocessor whose code is provided in the guide.