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xGrid sort an issue on column 1

Management noticed that the grid is sorting column 1 incorrectly (and seeminly randomly)

The grid is created as:
grdSearchResults = new dhtmlXGridObject('grdSearch_Results_Container')
grdSearchResults.setImagePath("images/grid_images/");
grdSearchResults.setHeader("Vendor Name,Lead Time,Minimum,Estimated Price,Delivery Charge");
grdSearchResults.setInitWidths("290,90,85,125,120");
grdSearchResults.setColAlign("left,center,center,center,center");
grdSearchResults.setSkin("xp");
grdSearchResults.setColTypes("ro,ro,ro,ro,ro");
grdSearchResults.setColSorting("str,str,str,str,str")
grdSearchResults.init();

It is then fill with these temp values:
gridAddRowSearch("Tonys Italian Cuisine","30-40 min", "$10.00","$21-30","$0.00");
gridAddRowSearch("Daisys BBQ","20-30 min", "$15.00","$21-30","$7.00");
gridAddRowSearch("5 Napkin Burger","30-40 min", "$20.00","$21-30","$0.00");
gridAddRowSearch("Mortons","10-40 min", "$40.00","$41-50","$5.00");
gridAddRowSearch("Pizza Heaven","30-40 min", "$20.00","$21-30","$5.00");

Here is that function
function gridAddRowSearch(sRestaurant,sLeadTime,mMinimum,sEstimatedPrice,mDeliveryCharge) {
var sStyle = "color:#58585a;font-family:Arial;font-weight:normal;font-size:10pt;";
var iRow = (grdSearchResults.getRowsNum() + 1);
var sURL
var sFunction
var sTitle = "Restaurant detail info to go here" //There is an issue with title, maybe because of the mouseover


sTitle = replaceAll(sTitle, " ", sSpace);
sRestaurant = replaceAll(sRestaurant, " ", sSpace);
sFunction = "showRestaurantPopup(\\'"+iRow+"\\',\\'"+sRestaurant+"\\');";

sURL = "<a href='#' style='color:#58585a;font-family:Arial;font-weight:normal;font-size:10pt;text-decoration:none;' onclick='selectRestaurant();' onmouseover=setTimeout('"+sFunction+"',1000)>"+sRestaurant+"</a>"
grdSearchResults.addRow(iRow,[sURL,sLeadTime,mMinimum,sEstimatedPrice,mDeliveryCharge]);
grdSearchResults.setRowTextStyle(iRow, sStyle);
}


Columns 2 through 5 sort correct.

However, for column 1 I get (asc)
Pizza Heaven
Mortons
5 Napkin
Daisys BBQ
Tonys Italian Cuisine

sorted desc
Tony's Italian Cuisine
Daisys BBQ
5 Napkin
Mortons
Pizza Heaven

I assume this might be something to do with the url code... but the url is, currently, the same for each line.

Thanks kindly,
James