Express unexpectedly calling post after completion of delete

I have the following delete method in my express node app:

/* Delete */
router.delete('/objects/object/:id', function(req, res){
  var db = req.db;
  var collection = db.get('mydb');
  collection.remove({ID: req.params.id}, function(error, numberRemoved){
    if(error){
      console.log(error);
    }else{
      console.log(numberRemoved + ' docs removed');
      req.flash('info','Coupon deleted');
      res.send('success');
    }
  });
});

I call it using jQuery ajax:

$.ajax({
  type: 'DELETE',
  data: {"_method":"delete"},
  url:window.location.pathname
})
  .done(function(){
    window.location.replace("../1");
  })
  .fail(function(){
    console.log('delete failed');
  });

This should be the end of it, but when the object has been deleted from my database, the post function on the same url is called:

router.post('/objects/object/:id', postObject(req,res));

How can I prevent this from happening?