Updating Order Details Not Accurate

if (!empty($array['custom_field5'])) { //if is update record
						$orderId = $array['custom_field5'];
						$orderClass = hikashop_get('class.order');
						$fullOrder = $orderClass->loadFullOrder((int)$orderId, true, false);

						//$orderObj = new stdClass();
						$fullOrder->order_billing_address_id = $array['customer'];
						$fullOrder->order_shipping_address_id = $array['customer'];
						$fullOrder->order_user_id = $customerID;
						$fullOrder->order_status = 'confirmed';
						$fullOrder->order_type = 'sale';
						
						//update full price
						//$orderObj->order_full_price = $array['total_value'];
						$fullOrder->receipt = $receiptFile;
						$fullOrder->branch = $array['record_branch'];
						$fullOrder->source = $array['record_source'];

						foreach ($fullOrder->products as $product) {
							$class = hikashop_get('class.order');
							JRequest::setVar('order_id', $fullOrder->order_id);
							JRequest::setVar('order_product_id', $product->order_product_id);
							$class->saveForm('product_delete');
						}

						$productarray = array();

						if (isset($array['product']) && $array['product'] != "") {
							// calculate the order full price
							$finalPrice = 0;
							$discount = 0;

							foreach ($array['product'] as $key => $value) {
								$data = Dt_salesHelper::ProductDetail($value["productsname"]);

								$product = new stdClass();
								
								$write['data'] = $data;

								//check if shipping item
								$shipping_id = $data->shipping_id;
								if (!empty($shipping_id)) {
									$write['shipping_id'] = $shipping_id;
									$db = JFactory::getDbo();
									$query = $db->getQuery(true);
									$query
										->SELECT('shipping_name,shipping_params')
										->FROM($db->quoteName('#__hikashop_shipping'))
										->where($db->quoteName('shipping_id') . ' = ' . $db->quote($shipping_id));
									$db->setQuery($query);
									$row = $db->loadAssoc();
									$shipping_price = $value['unitprice'] *  $value["quantity"];
									$shipping_name = $row['shipping_name'];
									$shipping_params = $row['shipping_params'];

									$order_full_price += $shipping_price; // add shipping cost if applicable
								} 
								//check if discount item
								else if ($data->product_id == '9'){
									$discount = $value['unitprice'] *  $value["quantity"];
									//$total_discount = preg_replace("/[^a-zA-Z0-9]+/", "", $total_discount);

									$write['discount'] = gettype($discount);

								}
								//normal product add
								else{
									$product->product_id = $value["productsname"];
									$product->order_product_price = $value['unitprice'];
									$product->order_product_quantity = $value["quantity"];
									$product->order_product_name = $data->product_name;
									$product->order_product_code = $data->product_code;

									$order_full_price += $product->order_product_price * $product->order_product_quantity;

									$productarray[] = $product;
								}
							}

							$fullPrice = $array['total_value'];
							$finalPrice = $fullPrice - $discount;

							$fullOrder->order_full_price = $order_full_price; // convert to double
							$fullOrder->order_discount_price = abs($discount); // remove negative sign from discount

						}

						$write['finalPrice'] = gettype($finalPrice);
						$write['finalPriceq'] = $finalPrice;
						$write['fullPrice'] = $fullPrice;
						$write['order_full_price'] = $fullOrder->order_full_price;
						$write['total_discount'] = abs($discount);

						if (empty($shipping_id)) {
							$fullOrder->order_shipping_id = ''; 
							$fullOrder->order_shipping_method = '';
							$fullOrder->order_shipping_price = '';
							$fullOrder->order_shipping_params = '';
						}else{
							$fullOrder->order_shipping_id = $shipping_id; 
							$fullOrder->order_shipping_method = $shipping_name;
							$fullOrder->order_shipping_price = $shipping_price; 
							$fullOrder->order_shipping_params = $shipping_params; 
						}
						
						/*if (empty($total_discount)) {
							$fullOrder->order_discount_price = '';
						}else{
							$fullOrder->order_discount_price = $total_discount; 
						}*/

						$fullOrder->cart->products = $productarray;

						$fullOrder->order_id = $fullOrder->order_id;
						$fullOrder->history = new stdClass();
						$fullOrder->history->history_notified = 1;

						unset($fullOrder->order_subtotal);
						unset($fullOrder->order_subtotal_no_vat);

						$orderClass->save($fullOrder);

						$write['saved'] = $fullOrder;

						$myfile = fopen("aUp.txt", "w") or die("Unable to open file!");
						fwrite($myfile,print_r($write,true));
						fclose($myfile);

					}