Data updated in the database even after successfully executing the method - php

Question

I'm trying to update a cross join table which has three columns. The first column studyID will be the same for all the ten row but heuristicID will be 1 to 10 for each row. Third column is h_priority which has only three values either l, m or h. I have retrieved the data and show it inside a table using a while loop in PHP so that all the 10 rows for that particular studyID is shown. The h_priority data is shown inside a select option. When I click the submit button it should update the h_priority column by checking the combination of studyID and heuristicID in the cross join table but for some reason it is not updating anything in the database at the same time "Priority updated successfully" message comes in. Below is the method I used inside the class.
public function updatePriority($studyID, $heuristicID, $h_priority) {
$query = "UPDATE heuristic_priority SET h_priority = ? WHERE studyID = ? AND heuristicID = ?";
$stmt = $this->upc->prepare($query);
$stmt->bind_param("iis", $studyID, $heuristicID, $h_priority);
if ($stmt->execute()) {
return true;
}
else {
return false;
}
}
This is the code for the table
<?php
include_once '../classes/heuristics.php';
$fetchdata=new Heuristic();
$sql=$fetchdata->h_get_priority($passed_studyID);
$cnt=1;
while($row=mysqli_fetch_array($sql))
{
echo '
<tr>
<td id=id'.$cnt.'>
<div class="hide-heuristicid">
<input type="text" name="studyid[]" value="'.$row['studyID'].'" required>
</div>
</td>
<td id=id'.$cnt.'>
<div class="hide-heuristicid">
<input type="text" name="heuristicid[]" value="'.$row['heuristicID'].'" required>
</div>
</td>
<td id=id'.$cnt.'>
<div>
'.$row['h_title'].'
</div>
</td>
<td id=name'.$cnt.'>
<div>
<select name="priority[]">
<option value="'.$row['h_priority'].'" '.($row['h_priority'] == 'l' ? 'selected' : '').'>Low</option>
<option value="'.$row['h_priority'].'" '.($row['h_priority'] == 'm' ? 'selected' : '').'>Medium</option>
<option value="'.$row['h_priority'].'" '.($row['h_priority'] == 'h' ? 'selected' : '').'>High</option>
</select>
</div>
</td>
</tr>
';
}
?>
This is the PHP code
if (isset($_POST['submit'])) {
$studyID = isset($_POST['studyID[]']) ? $_POST['studyID[]'] : '';
$heuristicID = isset($_POST['heuristicID[]']) ? $_POST['heuristicID[]'] : '';
$h_priority = isset($_POST['h_priority[]']) ? $_POST['h_priority[]'] : '';
$updatePriority = new Heuristic();
if ($updatePriority->updatePriority($studyID, $heuristicID, $h_priority)) {
echo "Priority updated successfully";
}
else {
echo "Failed to update priority";
}
}