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But my Shadow Rank is 41 so divide it by 6 and I get 6,83 round it down to 6. So I should be getting 6% votes from all above FVL. But I'm getting only 4%. Can you have a look on that?

Shadow rank is only part of the equation now, they also figure in your SP as a component of how much you contribute to the pool. See https://shadowbot.us/shadowbot/voting.dec.31.2017.php for a full chart.