The bar chart component shows only 2 data values on the same x value, all others are shown in the legend, but not in the chart itself.
Example: Check attached file.
The blue and pink data is not shown in the chart. Hint: If you try the example with only 3 values, the same thing happens.
For me, it looks like only the 2 values are drawn with the correct color and the others are printed but aren't displayed (They seem to be transparent).
If you unceck e.g. series value 3 from the legend items, the space between the other values expands, so the other values seem to be there but not drawn in the correct color.