When I open crystal reports in a different tabs they all share the same data source. How can I change that?

I have a C# ASP .NET MVC application that uses Crystal reports.

My problem is that when I open for an example two reports in two different tabs, my report data source is bound to the last one opened. So, if I open the first report in one tab, and after that the second, when I try to save the first report, or refresh it, it will use the data source from the second(last one opened). I don't know how to change my code to make it work.

This is my code for creating the report:

public void createRep()
        {
            try
            {

                bool isValid = true;
                
                string repName = HttpContext.Current.Session["repName"].ToString();

                
                int zgradaID = (int)HttpContext.Current.Session["id_zgradePregledStanaraPoZgradi"];

                if (string.IsNullOrEmpty(repName))
                    isValid = false;

                if (isValid)
                {
                    int zid = zgradaID;


                    ReportDocument rd = new ReportDocument();
                    string repPath = Server.MapPath("~/Izvestaji/") + repName;

                    rd.Load(repPath);

                    Izvestaji.IzvestajiRep irep = new Izvestaji.IzvestajiRep();
                    
                    rd.SetDataSource(irep.PregledPoStanaruDS(zgradaID));
                    
                    CrystalReportViewer1.ReportSource = rd;
                    this.CrystalReportViewer1.ReuseParameterValuesOnRefresh = true;


                    

                }
                else
                {
                    Response.Write("<h2>Izvestaj nije pronadjen!</h2>");
                }

            }
            catch (Exception ex)
            {

                Response.Write(ex.ToString());
            }
        }