Hello, PP17.
Let's go ahead and try to run the Trial Balance report to get the total amount of the correct transactions. Also, when entering an opening balance an income and accounts receivable (A/R) is impacted for debtors, and expense and accounts payable (A/P) account for creditors. The reports are selected as the default account when you created your account.
For more insights about the balance, you visit the article I recommend below:
How to set up customer or supplier opening balance.
If you have any follow up questions, please let me know. I'm here for you. Have a great day.