Tracking Jumps when Exporting

Hello, I use DaVinci 15.0.1.003,
I have a tracker on my clip. In the program everything is fine, but when I deliver the Clip the tracker sometimes jumps. It look like the tracker is incorrect and every frame the tracker jumps from Position A to Position B back and forth.

Is there any solution for this?

THX

Paul

I now retrack every clip and now it works... strange bug.
I think this was because on output I make a select on Handle Frames after that this happens.