Sales Order Search Results

I am searching for all sales orders made by a customer.  The results seem a little strange; however.  I am 3 results for each sales order.  Does anyone know why it's returning 3 results for each Sales Order and if there's a way to only get one returned?

Here's my search:

var soFilters = new Array();
        soFilters[0] = new nlobjSearchFilter('entity', null, 'is', cusID);

        var columns = new Array();
        columns[0] = new nlobjSearchColumn('trandate');
        columns[1] = new nlobjSearchColumn('status');

        var searchresults = nlapiSearchRecord('salesorder', null, soFilters, columns);


        for ( var i = 0;i < searchresults.length; i++ ){
            nlapiLogExecution('DEBUG', 'loop: '+i);
            var searchresult = searchresults[i];         
        }

When I log the searchresult ID, each sales order shows up 3 times.