Hi Sonam,
Which version of MII are you using. There was a fix done in MII 15.0 SP03 which I think will address your requirement. In case you are on an older release then Swaroop's suggestion should help.
Try rendering the chart without configuring label columns, chart has been enhanced to consider all the columns excluding those selected as Value Columns for x-axis.
Thanks and Best Regards,
Ria