lol.php

<?php

$addedRows = 0;
(...)

            // Keep the order
            // Reset it here, not in the if, so it always! gets resetted.
            $addedRowsToCurrent = 0;
            if ($grouped == AdminList::GROUPED_FOR_TAX_RELIEF && $row['tax_allocation_exists'] == 1) {
                /**
                 * @var \Crowdcube\TaxReliefAllocator\Service $taxReliefService
                 */
                $taxReliefService = container('tax-relief-service');
                $allocation = $taxReliefService->getAllocationsByInvestmentId($row['inv_id']);

                foreach ($allocation as $allocationRow) {
                    // Keep the indexes. Take the rows added earlier + the rows added now.
                    $investorList[$i + $addedRows + $addedRowsToCurrent] = $investorList[$i];
                    // Added one row.
                    $addedRowsToCurrent++;
                }
            }

            $i++;
            $addedRows += $addedRowsToCurrent;
        }