Sorting Issue

I have a column with the numeric values but with a hyperlink.
I want to sort the column in ascending/descending order for numbers.

While sorting, the number doesnot get sorted in asc/desc order.

I have implemented

var num = new AW.Formats.Number;
num.setTextFormat("#####"); 
obj.setCellFormat([str, str, num, num, num]);

Can you please let me know what is the problem and how to resolve this issue.

Thanks in Advance.