What’s wrong with the picture? 
You have hidden some track types?
Did you move the track after it was created? Do you have sync project and mixer selected?
I didn’t move it.
And I think I’ve the Sync Project and Mixer selected on Preferences… (I’ve to check that tomorrow)
I’ve some hidden tracks…
This happens after I create that track.
The workaround is to close the Mixer and open it again and it’s ok then.
Bump
You can ‘re-order’ the channels in the Inspector > VST Instruments.
Mauri.
Hum? 
Sometimes this is very annoyed. Cause on the Euphonix those tracks in an wrong order…
Were you by chance editing those channels at the time this anomaly cropped up? When I did quick editing in SX3, sometimes a channel would move up the screen 
It never did any harm, all edits, routings and FX went with it so I wasn’t too concerned. I slowed down a bit and it rarely happened. Might be a legacy of that carried into C6…
I don’t know yet when this happens…
But should be investigated…
This is happening regularly for me since C6…on first creation of a track somewhere in the middle of an existing project it will appear either one or 2 slots away from where it should be on the mixer.
The same track in the inspector is in the correct place…moving the track in the inspector & then moving it back also corrects it.
Bump
Used to happen in C5 too. Closing / reopening the mixer window usually puts the tracks in the correct order.