Codeigniter PHP form not submitting

<?php if(isset($employees)) { ?>
                      <form method="POST" action="<?=site_url('insertincrement') ?>" >
                      <tbody>
                      <?php foreach($employees as $row) { ?>
                      <tr>
                          <input type="hidden" name="employeeid[]" value="<?=$row['employeeid']?>">
                          <td><?=$row['employeename']?></td>
                          <td><?=$row['fathername']?></td>
                          <td><?=$row['gender']?></td>
                          <td><?=$row['department']?></td>
                          <td><?=$row['designation']?></td>
                          <td>
                          <input type="number" name="increment[]" class="form-control">
                          <input type="hidden" name="updateddate[]" value="<?=date('Y-m-d'); ?>">
                          </td>
                          <td><input type="text" name="remarks[]" class="form-control"></td>
                      </tr>
                      <?php } ?>
                      <tr>
                          <td></td>
                          <td></td>
                          <td></td>
                          <td></td>
                          <td></td>
                          <td></td>
                          <td><button type="submit" class="btn btn-success btn-sm">Add Increments</button></td>
                      </tr>
                  </tbody>
                  </form>
                  <?php } ?>