Hi @automation_viome ,
Can you confirm the 2T tube carrier is snapped on to the deck? See below for an example:
Can you also confirm the X location when you see it shift to the left?
This issue is typically seen when the coordinate of the tube carrier is shifted too far to the left or right. Venus takes this location into consideration when determining the track. If it is shifted too far to the left, it will round down to the earlier track.
If you need to shift the location due to teaching, you need to apply it to the labware definition as opposed to the deck.
