Unwanted symbol are getting displayed along with (X) close button in dialog box header.

Unwanted symbol are getting displayed along with (X) close button in dialog box header.

I am getting unwanted symbol along (X)close button in jquery dialog box header only in smartphone(In desktop and tablets it work's fine).
I am using the following code to create a dialog box.
How do i remove the unwanted symbol from the dialog box header.


$("#addmeetingdialog").dialog({
autoOpen: false,
position: ['center'],
modal: true,
width: 'auto',
height: 'auto',
buttons: {
        'Save' : function() {   
            $("#iframemeeting")[0].contentWindow.currentmeeting();
            $(this).dialog('close');
        },
         'Cancel' : function() {
            $(this).dialog('close');
            $("#mainadddialog").dialog("open");
        },
       
    }
});


Thanks
R.Ramesh