In my code sometimes PhpStorm is adding strange characters for example "`/".

My code original:

$.ajax({
                type: 'POST',
                url: 'actions/tests/submitAnswer.php?question_id=' + question_id + '&fill_test_answers=' + test_time_mode,
                data: $('#submitQuestion').serialize(),
                success: function (data) {
                    /* ... */
                }
            });

My code in web browser:

$.ajax({
                type: 'POST',
                url: 'actions/tests/submitAnswer.php?question_id=' + question_id`/ + '&fill_test_answers=' + test_time_mode,
                data: $('#submitQuestion').serialize(),
                success: function (data) {
                    /* ... */
                }
            });