Ah, I see...
We discuss it with Sally from support team since last 3 days, and yes - it's one of the cards which cause problems during calibration.
For a now I was able to get it in tune. Also it's not so easy in my situation to order a new card from Sequential directly, so I would like to try to show the card to my local tech and see if it's possible to do something about it.
I should also say that support was top notch, Sally took a good care of this case : )
However, if someone had an experience with "repairing" a problematic Voice Card, please share your thoughts.