Hi Vijesh,
That's a default behavior. When you export a Crosstab to Excel Data Only format it leaves one row blank from the top.
Since the Text field you've used as the Row Label is not part of the Crosstab itself, it starts from the very first row/column.
Have a look at this thread where the user has the same issue when exporting a Crosstab to Excel Data Only.
-Abhilash