Record date of change of two cells in one

Question

The following code detects whether a change has been made to a cell in column I or J, and records the date and time the change occurred in column M and N.

I want there to be only one record, that is, it does not record in column N, but only in M. But it is not working, it ends up recording a change for each cell in two respective cells, as in the figure.

How to change this?

function onEdit(event) {
 var ActiveSheet= SpreadsheetApp.getActiveSheet();
   var capture = ActiveSheet.getActiveCell();
   if(capture.getColumn() == 9 || capture.getColumn() == 10 && ActiveSheet.getName() == "AlertaCompleto" ){
     var add = capture.offset(0,4);
       var data = new Date();
       data = Utilities.formatDate(data, "GMT-03:00","dd-MM-yyyy' 'HH:mm:ss' '");
       add.setValue(data);
   }
}

​