This behavior is caused by the fact, that RadCartesianChart treats "1" as the same category, each time it finds it. It is not aware of the meaning you put in it -- millisecond, second, minute, etc. A possible workaround here is to place whitespaces in the strings used for category. This way the user would still see "1" while the chart will print "1" for millisecond, " 1" for second, " 1 " for minute, etc.
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