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Captcha and session problem in Ajax Form?

The form works fine without captcha, but it only works 1 time when I add captcha. and captcha numbers always stay the same. In ajax form, I want the captcha to be refreshed after every submission, that's why I added it but it's not working either.

img = document.getElementById("capt");

img.src = "captcha.php"

Thank you in advance for your help on how to solve this problem.

index.php

    
    <!DOCTYPE html>
    <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
    </head>

    <body>
    <form name="checkaddress" id="checkaddress" method="post">
    <input type="text" id="v" value="" name="v"><br>
    <img src="captcha.php" id="capt"> <input type="text" size="10" name="deger" id="deger"> 
    <button type="submit">Enter</button>
    </form> 

    <span class="vertr"></span>
                    
    <script>
    $('#checkaddress').on('submit', function(e) {
        e.preventDefault();
        // get formdata in a variable that is passed to the ajax request
        var dataToPassToAjax = $(this).serialize();
        $.ajax({
            url: "send.php",
            type: "POST",
            data: dataToPassToAjax,
            cache: false,
            success: function(resultHtml) {
                // add the returned data to the .vertr element
                $('.vertr').html(resultHtml).fadeIn('slow');
                $('#v').val('');
                $('#deger').val('')
                img = document.getElementById("capt");
                img.src = "captcha.php"
         }
        });
        // cancel the default form submit
        return false;
    });
    </script>
    </body>

    </html>

send.php:

    <?php 
    session_start();
    if ($_POST['deger'] == $_SESSION['captcha']) {
    $v= $_POST['v'];    
    echo "Hello $v";
    }
    else echo "CAPTCHA Not Detected";
    ?>

capctha.php

    <?PHP

    $image = @imagecreatetruecolor(95, 30) or die("hata oluştu");

    // create the background color
    $background = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
    imagefill($image, 0, 0, $background);
    $linecolor = imagecolorallocate($image, 0xCC, 0xCC, 0xCC);
    $textcolor = imagecolorallocate($image, 0x33, 0x33, 0x33);

    // generate random lines
    for ($i = 0; $i < 2; $i++) {
        imagesetthickness($image, rand(1, 3));
        imageline($image, 0, rand(0, 30), 95, rand(0, 30), $linecolor);
    }

    session_start();

    // generate random numbers
    $sayilar = '';
    for ($x = 15; $x <= 75; $x += 20) {
        $sayilar .= ($sayi = rand(0, 9));
        imagechar($image, rand(3, 5), $x, rand(2, 14), $sayi, $textcolor);
    }

    // we pass the numbers to the session
    $_SESSION['captcha'] = $sayilar;

    // the image is displayed and then deleted
    header('Content-type: image/png');
    imagepng($image);
    imagedestroy($image);
    ?>
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