Undefined Index & Update Query - php

Question

I am trying to update mysql data from user input displayed on a table, i have used the following code, even though the name is set and the value is set when i click update the code states "Undefined index: LHA" but as you can see i have declared this along with Work_date, LHA, AAS, LSA, AAH (the fields throwing the undefiend index errors) I also want the unefcted data to remain the same in the mysql database as apposed to settting it to blank! This is the HTML (A while statement to fetch the data to populate the value fields in the html table)
while($row = $sth->fetch()) { ?>
<form action='../action.php' method='post'>
<tr>
<td> <?php echo $row['Name'] ?></td>
<td> <input name='car' id='car' value="vv1"><br/><br/></td>
<td> <select name='Night' id='Night'><option selected='selected' value='no'>No</option><option value='Yes'>Yes</option></select> <br/><br/></td>
<td> <input class='text' name="Siteid" type="text" value="<?php echo $row['Workbook ID']; ?>" /> <br/><br/></td>
<td> <input class='datepicker' name="Work_date" type="text" value="<?php echo date('l, F d, Y', strtotime($row['Work Date'])) ?>" placeholder="Select Date!"/><br/><br/></td>
<td> <input class='timepicker' name="LHA" type="text" value="<?php echo $row['LHA'] ?>" /><br/><br/></td>
<td> <input class='timepicker' name="AAS" type="text" value="<?php echo $row['AAS'] ?>" /><br/><br/></td>
<td> <input class='timepicker' name="LSA" type="text" value="<?php echo $row['LS'] ?>" /><br/><br/></td>
<td> <input class='timepicker' name="AAH" type="text" value="<?php echo $row['AAH'] ?>" /><br/><br/></td>
<td> <input name="Bonus" type="text" value="<?php echo $row['Bonus']; ?>" /> <br/><br/></td>
<td> <input name="Work_Completed" type="text" value="<?php echo $row['Work Completed']; ?>" /> <br/><br/></td>
<td> <input name="BH" type="text" value="<?php echo $row['Hours']; ?>" /><br/><br/></td>
<input type='hidden' name='PID' value="<?php echo $row['PID'];?>" />
<td><input type='submit' name='delete_timesheet' value='delete' /></td>
<td><input type='submit' class='btn btn-default' name='update_timesheet' value='Update' /></td>
</tr>
</form>
<?php
}
Just to mention my query and field settings work perfectly on XAMPP but not when online, this is my PHP
if(isset($_POST['update_timesheet'])) {
$a = $_POST['car'];
$b = $_POST['Night'];
$c = $_POST['Siteid'];
$d = $_POST['Work_date'];
$e = $_POST['LHA'];
$f = $_POST['AAS'];
$g = $_POST['LSA'];
$h = $_POST['AAH'];
$i = $_POST['Bonus'];
$j = $_POST['BH'];
$l = $_POST['PID'];
$Paid = create_paid($e, $f, $g, $h);
$stmt = "UPDATE data SET Car = ?, Night = ?, `Workbook ID` = ?, `Work Date` = ?, LHA = ?, AAS = ? , LS = ? , AAH = ? , Bonus = ?, `Work Completed` = ?, Hours = ? WHERE PID = ? ";
$y = $pdo->prepare($stmt);
$y->execute(array($a,$b, $c, $d, $e, $f, $g, $h, $i, $j, $Paid, $l));
header('Location: ' . $_SERVER['HTTP_REFERER']);
}