Click on the track's Name in the mixer...
Then move over and left click on the instrument description in the mixer. A menu pops up, and top option in the Multi picker. Click on it and see what track is highlighted in the Multi picker.

The first time it's sometimes correct. Now repeat again with another track in the mixer. Sometimes stays on first track in multi picker.

Or, sometimes just comes up on wrong track by itself. Apparently the mixer and the picker aren't linked together.