Tracking with python sdk way worse with own class than with coco person class

[NicolasPetermann134]

Hi
I've run my fine-tuned rtm model (detect + pose) and noticed that the tracking is way worse running the model for a video with the SDK for my own class. When I run for my own class with det_interval = 1, the detections are looking pretty good - the kpts are visible all the time in the video. But when I put det_interval from 1 to 5 or 10 it looks like the kpts are "blinking" for my own class but with the class person from coco it looks pretty good, meaning, the kpts are all the time visible in the video for this class.
What do I wrong?

In addition, I noticed that the jittering is way higher with my own class, how could I reduce that?

I would be very grateful for any suggestion.