Sort Column Break Searching Column

I have a grid that has a text box as a 2nd header.
If i dont sort the column, and search, it works fine. However, if i sort the column, then search, the indecdes of the columns are messed up.

Any ideas on how to fix this?

Here is my search function:

var first_found = 0;
    input1.onControlValidated = function(text){
        
        var i, rows = [], max = obj.getRowCount(); 
        for (i=0; i<max; i++){ 
            if (obj.getCellValue(0, i).toLowerCase().search(text.toLowerCase()) > -1){ 
                obj.selectRow(i);
                obj.setScrollTop(i * 18);
            } 
        } 
    }