The horizontal auxiliary lines in the my Drive graphic do not match the displayed Y-values.
In this example, there are always three lines that are always displayed at the same height, regardless of whether SoC, power, altitude or speed is displayed.
The numbers on the Y-axis are also not displayed at the height of the auxiliary lines.
Yes, we tried finding a solution which looked OK and gave a better way to read the chart values but could not find anything useful. So for now we just disabled the grid lines.