Column Chart convert string data to integer on x-axis

Hi all, I want to use Mendix Column Chart (see below) to show part number (x axis) and its quantity (y axis) but the x axis “converts” the part number which is of string data type to what looks like integer (e.g. part number “001” to 1) . Furthermore, part number such as “abc1234” is totally ignored in the chart even though it is stored in table as seen in the grid. I am using a non-persistable table created via microflow  as the data source for the column chart.  Any idea what might have caused this issue and advice to fix it ? Th  
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