ทำไม fetch array แล้วข้อมูลออกมาแค่ 1 record จากทั้งหมด

$servername = "localhost";
	$username = "root";
	$password = "";
	$dbname = "dbuba";
	
	session_start();
	
	// Create connection
	$conn = mysqli_connect($servername, $username, $password, $dbname);
	mysqli_set_charset($conn,"utf8");
	
	// Check connection
	if (!$conn) {
    	die("Connection failed: " . mysqli_connect_error());
	}
	
	$sqlApplication = "SELECT idcard FROM tb_app WHERE idcard = $_POST[idcard]";
	$sqlTestResult = "SELECT TestID, Score, IdentityCard FROM tb_test_result WHERE IdentityCard = $_POST[idcard]";
	
	$queryApplication = mysqli_query($conn, $sqlApplication);
	$queryTestResult = mysqli_query($conn, $sqlTestResult);
	
	$resultApplication = mysqli_fetch_array($queryApplication, MYSQLI_ASSOC);
	$resultTestResult = mysqli_fetch_array($queryTestResult, MYSQLI_ASSOC);
	
	if (!$resultApplication) {
		header("location:logintest.php");
	} else {
		if ($_POST["idcard"] != $resultTestResult["IdentityCard"]) {
			$_SESSION["idcard"] = $_POST["idcard"];
	
			$sqlTest = "SELECT tb_test.idTest, tb_test.test, tb_test.testType
				 		FROM tb_app
				 		INNER JOIN tb_position
				 		ON tb_app.position1=tb_position.position
				 		INNER JOIN tb_position_test
				 		ON tb_position.disc=tb_position_test.disc
				 		INNER JOIN tb_test
				 		ON tb_position_test.idTest=tb_test.idTest
				 		WHERE idcard = $_SESSION[card]";
			$queryTest = mysqli_query($conn, $sqlTest);
			while($resultApplication = mysqli_fetch_array($queryTest, MYSQLI_ASSOC))
			{
				$sql = "INSERT INTO tb_test_result (TestID, IdentityCard) VALUES ($resultApplication[idTest], $_POST[idcard])";
				$query = mysqli_query($conn, $sql);
			}
		//header("location:maintest.php");
		}
		else if (($_POST["idcard"] == $resultTestResult["IdentityCard"]) and ($resultTestResult["Score"] == null)) {
			while ($resultTestResult = mysqli_fetch_array($queryTestResult, MYSQLI_ASSOC)) {
				echo $resultTestResult["TestID"];
			}
		}
		else {
			echo "<script>alert('already exists');</script>";
		}
	}
	
	mysqli_close($conn);