I am trying to know that which plugin or observer will work perfectly while saving order data in sales_order table. Actually i am trying to debug a scenario where only for one order, Grand Total < SubTotal in Admin Order Grid. Means it's mysteriously discounted an Order without applying a coupon.
This case only for one order from >1000 orders but not able to reproduce this issue once again until it will not reproduce.
If any help will be appreciated.