Hi,
yes, it's a bug in console. In 2.0.4 we changed drawing of inverted values - before that values were inverted before passing to chart for drawing, hence negative values in legend. Now inverted drawing functionality moved into chart widget, so it shows correct values in legend.
Fix for that will be included in 2.0.5 and 2.1-M1, I can also make console build from current development branch if needed.
Best regards,
Victor