Issue with drawing overlapping bounding boxes during the prediction phase after training a multiclass detection using RF-DETR

I trained an RF-DETR model using my own dataset. When I run predictions using the model I obtained after training, I get multiple overlapping bounding boxes (sometimes overlapping for the same class, sometimes for different classes). I know that RF-DETR is an NMS-free model, but how can I resolve this issue?

@Borda