Php not returning the latest updated sql procedure result

Im using mariaDB, codeigniter php

when execute the procedure in workbench it showing correct result.

But when i run the same procedure using the php codeigniter its return different result set.

array(1) {
[0]=>
array(1) {
    [0]=>
    array(2) {
        ["stuScore"]=> string(7) "44.0000"
        ["answerdQues"]=> string(2) "50"
    }
}
}

query in procedure...

SELECT sum(Score) as stuScore, count(distinct ta1.idTestQuestion) as answerdQues
            FROM (select ta0.*, @running_time := if(@running_student = idStudent, @running_time, 0) + ta0.TimeTaken, date_add(ta0.StartTime, INTERVAL @running_time SECOND) as running_time, @running_student := idStudent
                from (select tap.idStudent, ta.score, ta.idTestQuestion, tap.StartTime, ta.TimeTaken
                    from `testanswerpaper` tap
                    left join testanswer ta on ta.idTestAnswerPaper = tap.idTestAnswerPaper and (ta.Status = 'Flagged' || ta.Status = 'Answered')
                    where  tap.`idTestQuestionPaper` = TestQuestionPaperID
                    order by tap.idStudent, ta.SortOrder, ta.idTestAnswer
                ) ta0
                join (select @running_time := 0, @running_student) running
            ) ta1
            join student s on s.idStudent = ta1.idStudent
            join user u on s.idUser = u.idUser
            WHERE ta1.running_time <= now()
            group by ta1.idStudent
            order by stuScore desc, answerdQues DESC;

php code is

$this->readDB = $this->load->database('read', TRUE);
        $connectId = $this->readDB->conn_id ;
        $sql = "call GetLeaderBoardData($TestQuestionPaperID);";
        if (mysqli_multi_query($connectId,$sql))
        {
            do
            {
                // Store first result set
                if ($result=mysqli_store_result($connectId)) {

                        $resultArray[] = mysqli_fetch_all($result, MYSQLI_ASSOC);

                }
            } while (mysqli_next_result($connectId));

        } 
        var_dump($resultArray);

The difference might come from the fact that the user-defined variables might have different values when you execute the code from workbench vs codeigniter as the user-defined variables keep their values throughout the session.

To rule this out, reset the @running_time and @running_student values at the beginning of the procedure.

set @running_time = null;
set @running_student = null;

SELECT sum(Score)...