It's great to have you again in the Community, @Su Lei Tun.
Your retained earnings from the 2018 financial year may differ from this year. You may have an entry with only affecting the Balance Sheet accounts against the Retained Earnings account.
You can compare your balance sheet and last financial year's profit and loss to verify the difference. Make sure both reports have the same reporting method.
To learn more about the details of your retained earnings account, you can check this article: How to view Retained Earnings account details.
If you have additional questions or any clarifications, comment it down below. I’ll be ready to pop-in and help. Have a fantastic day!
