Display negative value in stacked column chart.

When displaying a value in a stacked column chart, if the value is negative, the negative value should be drawn from the 0 position of the y-axis or from below the other negative value if it exists. Similarly, the positive value after the negative should be drawn from the 0 position of the y-axis or from above the other positive value if it exists. But instead, in both cases, they are being drawn from the end of the previous value, resulting in overlapping.