Problem with date range custom filters

Hi,
We have a requirement where we have to create two date range filters which should filter the data by from date and to date. We have created custom filters like below:

dhtmlXGridObject.prototype._in_header_daterange_filter=function(a,b){

  a.innerHTML="<div style='width:100%''><input  id='datefrom'  style='width:45%;float:left;font-size:11px;font-family:arial;'><input id='dateto' style='width:45%;float:left;font-size:11px;font-family:arial;'></div>";

  a.onclick=a.onmousedown=function(a){
     return(a||event).cancelBubble=!0
  };
  
  a.onselectstart=function(){
     return event.cancelBubble=!0
  };
        
  datefrom = getChildElement(a.firstChild,"datefrom");
  dateto = getChildElement(a.firstChild,"dateto");
  
  myCalendar = new dhtmlXCalendarObject([datefrom , dateto])
  formatDateforDHTMX();

  myCalendar.setDateFormat(localDateFormat);      //Date format MM/DD/YYY
  myCalendar.hideTime();
  
  myCalendar.attachEvent("onClick",function(date){
	  globalActiveDHTMLGridObject.filterByAll();
  })

  this.makeFilter(datefrom ,b);
  this.makeFilter(dateto ,b);
        
  datefrom._filter=function(){
     var a=this.value;
     return a==""?"":function(b){
        
        aDate = parseDate(a)
        bDate = parseDate(b)   
        return aDate <= bDate ;
        
     }
  }
  
  dateto._filter=function(){

     var a=this.value;
     return a==""?"":function(b){
        aDate = parseDate(a)
        bDate = parseDate(b)   
        return aDate >= bDate 
     }      
  }

  this._filters_ready()      

};

This is working perfectly fine. But because of this we are getting problem with other column filters. Suppose if we have column 0,1,2,3,4,5 and #daterange_filter is applied to columns 2,3 then the filters on 4,5 columns(#text_filter etc) are not working. But if we remove this.makeFilter(dateto ,b); line in above code its working fine.

Can you please let us know what is the problem with above code?

Unfortunately the issue cannot be reproduced locally.
If the problem still occurs for you please, provide with a complete demo, where it can be reconstructed.