The time and sales window in TWS often displays prices that fluctuate as they should, but are shifted away from the actual price range by, what it seems, a constant off-set. (Curiously, the top most price displayed is correct, but the value added to the tape is then off-set.) I have seen mild off-sets such as consistently 10c above or below the actual price. And I have seen insane off-sets, such that the time and sales on a $4 stock was actually fluctuating somewhere around zero, even going into the negative. This is very surprising to me, especially considering that trade execution history is supposed to be a regulated standardized feed. Does anyone else experience this problem with IB data feed? If so, is there any way to fix that offset and have actually consistently precise data?