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app/Services/BackflowService.php

@@ -39,6 +39,7 @@ class BackflowService extends BaseService
         $difference = abs($difference);
         if ($difference >= $restriction) {
             $backflow->amount = bcmul($difference, $backflow->backflow_ratio, 2);
+            $backflow->amount = $difference;
         } else {
             $backflow->amount = 0;
         }