Radscheduler calling onclientappointmentmoveend twice when I try to move appointment

//Javascript function call on Rad scheduler event 
function OnClientAppointmentMoveEnd1(sender, args) {                
                var scheduler = null;               
                // Cache the Scheduler object reference so we don't have to retrieve it every time
                scheduler = sender;
                try {
                    hideActiveToolTip();
                    if ($("#<%=hdnEditeTicket.ClientID%>").val() == 'N') {
                        noty({ text: 'You do not have permission!', type: 'warning', layout: 'topCenter', closeOnSelfClick: true, timeout: 1000, theme: 'noty_theme_default', closable: false, dismissQueue: true });
                        args.set_cancel(true);
                    }
                    else {
                        var appt = args.get_appointment();
                        var list = appt.get_attributes();
                        var attrAssigned = list.getAttribute('assigned');
                        var _NewStartDate = args.get_newStartTime();
                        var todaysDate = getFormattedString(_NewStartDate);
                        var NewTimeSlotIndex = args.get_targetSlot().get_index();
                        var TicketId = appt._id;
                        var resource = args.get_targetSlot().get_resource(); 
                        var workername = resource.get_text();

                        if (appt != null && list != null && attrAssigned != null && NewTimeSlotIndex != null) {
                            if (attrAssigned == "4") {
                                noty({ text: 'It is not allowed to move the completed ticket.', type: 'warning', layout: 'topCenter', closeOnSelfClick: true, timeout: 500, theme: 'noty_theme_default', closable: false, dismissQueue: true });
                                args.set_cancel(true);
                            }
                            else if (attrAssigned != "4") {  
								//This Popop is called Twice
                                if (confirm('Do you really want to move ' + appt._subject + ' ?')) {
                                    //call Ajax request
                                    $.ajax({
                                        type: "POST",
                                        contentType: "application/json; charset=utf-8",
                                        url: "ScheduleBoard.asmx/AppointmentMove",
                                        data: '{ "TicketId" : "' + TicketId + '", "TimeSlotIndex": "' + NewTimeSlotIndex + '", "StartTime": "' + todaysDate + '", "workername" : "' + workername + '" }',
                                        dataType: "json",
                                        async: false,
                                        success: function (data) {                                            
                                            console.log(data.d);                                                                                                                                   
                                        },
                                        error: function (result) {
                                            alert(result.responseText);
                                        },
                                        failure: function (result) {
                                            alert(result.responseText);
                                        }
                                    });                                   
                                    args.set_cancel(true);                                   
                                }                                 
                                else {
                                    args.set_cancel(true);
                                }
                            }
                        } else { args.set_cancel(true); }

//RadScheduler Event
<telerik:radscheduler id="RadScheduler1" runat="server" skin="Material" cssclass="RadScheduler1" rendermode="Lightweight" 
showheader="true" 
showfooter="false" 
width="99%" height="630px" shownavigationpane="true" 
customattributenames="id" 
displaydeleteconfirmation="false" 
allowdelete="false" 
starteditinginadvancedform="false" 
startinsertinginadvancedform="false" 
showalldayrow="true" 
enableexacttimerendering="true" 
onclientappointmentcontextmenu="OnClientAppointmentContextMenu" 
onclientappointmentmoveend="OnClientAppointmentMoveEnd1" 
<="" telerik:radscheduler="">