Hi,
Just a bug I have found. I have found something similar before with the DateTime format of a category axis.
Please note the single lowercase 't' in the below appears to be being interpreted by the compiler as 'time' identifier (AM or PM). In this case, it is printing on the chart label as 'a'.
<ChartValueAxes>
<ChartValueAxis AxisCrossingValue="@AxisCrossingValue">
<ChartValueAxisLabels Format="@("{0}" + " a b c d e f g h i j k l m n o p q r s t u v w x y z")"></ChartValueAxisLabels>
</ChartValueAxis>
</ChartValueAxes>