Select from 6 tables get one result only - php

Question

I have about 6 tables and I am while looping on them the results comes 1 result it should be more
see my code here
$institute = $_POST['institute'];
$sections = $_POST['sections'];
$division = $_POST['division'];
$getSearch = $db->prepare("SELECT
a.name, a.phase, a.setNumber, a.email, a.sudImage, a.activity, a.id AS stud_id,
b.id, b.ins_name,
c.id, c.sec_name,
d.id, d.div_name,
e.id, e.std_id, e.sub_id, e.absence,
f.id, f.sub_name, f.subHour, f.level
FROM student_basic_info AS a
JOIN institutes AS b ON (a.institute = b.id)
CROSS JOIN ins_sections AS c ON (a.section = c.id)
CROSS JOIN ins_division AS d ON (a.division = d.id)
CROSS JOIN student_absence AS e ON (a.id = e.std_id)
CROSS JOIN ins_subjects AS f ON (e.sub_id = f.id)
WHERE a.institute =? AND a.section = ? AND a.division =?
GROUP BY a.id
");
$studSearch = array();
$getSearch->bind_param('iii', $institute, $sections, $division);
if ($getSearch->execute()) {
$results = $getSearch->get_result();
while ($vStud = mysqli_fetch_assoc($results)) {
$studSearch[] = $vStud;
var_dump($studSearch);
?>
the var_dump
array (size=1)
0 =>
array (size=17)
'name' => string 'الدفع النقدي' (length=23)
'phase' => string 'ابتدائي' (length=14)
'setNumber' => int 0
'email' => string 'johnef' (length=6)
'sudImage' => string '' (length=0)
'activity' => int 0
'stud_id' => int 7
'id' => int 3
'ins_name' => string 'معهد الفنون' (length=21)
'sec_name' => string 'فنون مسرح' (length=17)
'div_name' => string 'شعبة مرجانية 10' (length=26)
'std_id' => int 7
'sub_id' => int 3
'absence' => string '' (length=0)
'sub_name' => string 'فنون تطبيقية' (length=23)
'subHour' => string '2' (length=1)
'level' => string 'المستوي الأول' (length=25)
EDIT
SELECT a.name, a.phase, a.setNumber, a.email, a.sudImage, a.activity,
a.id AS stud_id, b.id, b.ins_name, c.id, c.sec_name, d.id, d.div_name,
e.id, e.std_id, e.sub_id, e.absence, f.id, f.sub_name, f.subHour, f.level
FROM student_basic_info AS a
JOIN institutes AS b ON (a.institute = b.id)
CROSS JOIN ins_sections AS c ON (a.section = c.id)
CROSS JOIN ins_division AS d ON (a.division = d.id)
CROSS JOIN student_absence AS e ON (a.id = e.std_id)
CROSS JOIN ins_subjects AS f ON (e.sub_id = f.id)
WHERE a.institute =1 AND a.section = 1 AND a.division =7
GROUP BY a.id
and yes I got the same results (1) record cam out which it should be at last (6) or (7) of records