wordpress : call ajax in the button click

issue :
– Calling ajax request and write text in the html .

problem :
– the first time when calling ajax and write the values in the div successfully
– the second time the ajax get the data (in the page source ) but the values in the div doesn’t change although the cache: false .
– i try to generate random number to show the issue well.

Code:

1-Ajax call :

$("#Finish").click(function () {
     $.ajax({
         type: 'POST',
         async: true,
         url: document.location.origin + "/air/ajaxCalls.php",
         dataType: 'json',
         cache: false,
         data: {
             ajaxType: "Finish",
             examid: 1,
             index: 2,
             qid: <? php echo $currentquestion ?> ,
             ansid: $('#tags').val(),
         },
         success: function (data) {
             //    alert("success");
             if (data) {
                 //    alert(data.status); 
                 // $("questiontext").html("next question");
                 // alert("data");
                 // alert('empty')

                 $('#tags').val("");

                 document.getElementById('questiontext').innerHTML = "<p>" + "<?php echo mt_rand() . getQuesName($currentquestion) . rand(); ?>" + "</p>";
                 document.getElementById('answerstext').innerHTML = "<?php getAnswers($currentquestion); ?>"

                 $("#questiontext").html("<?php echo mt_rand()?>");

                 $('input[type="checkbox"]').on('change', function () {
                     $('input[type="checkbox"]').not(this).prop('checked', false);
                 });

                 $('#check1').click(function () {});
                 $('#choose1, #check1').click(function () {
                     $('#check1').click();
                 });

                 $('#check2').click(function () {});
                 $('#choose2, #check2').click(function () {
                     $('#check2').click();
                 });

                 $('#check3').click(function () {});
                 $('#choose3, #check3').click(function () {
                     $('#check3').click();
                 });

                 $('#check4').click(function () {});
                 $('#choose4, #check4').click(function () {
                     $('#check4').click();
                 });

                 function Populate() {
                     vals = $('input[type="checkbox"]:checked').map(function () {
                         return this.value;
                     }).get().join(',');
                     // console.log(vals);
                     $('#tags').val(vals);
                 }

                 $('input[type="checkbox"]').on('change', function () {
                     Populate()
                 }).change();



                 if (data.status == 1) { ///sucess
                     alert('answer inserted');
                 }

             } else {
                 alert("Error : Please try again");
                 return false;
                 // no data found
             }
         },
         error: function (XMLHttpRequest, textStatus, errorThrown) {
             alert("Error : " + errorThrown);
         }
     });

 });

2 – receive calls:

 if ($_POST['ajaxType'] == "Finish") {
     echo json_encode(array("status" => 1));
 }

3- div (html)

<div id="questiontext">
    <p>

    </p>
</div>