BIRT Chart - X axis not sorted correctly

Migrateduser

<div>I'm getting data back from database and displaying it in BIRT Chart. I am plotting hour in X axis and reading (for that corresponding hour) in Y axis. I want the hour in X axis to be in ascending order like 0,1,2,3,4....23. So , I set the Grouping and Sorting in X Series to Ascending(screenshot attached). But, in the resulting chart ascending order has been applied to hour's first digit and then second digit i.e. it is displaying like 0,1,10,11,12,13....19,2,20,21,22,23,3,4,5...9(Attached the graph screenshot) Please refer to the attached screenshot and suggest me how to arrange the goruping and sorting.. Any help would be greatly appreciated..</div>