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Let me help you fix the credit applied in your account, salindawongagape.
It's possible there were duplicate applied payments to the prior invoice. We can run the Transaction List by Customer report to trace the duplicate one.
Then, look for duplicate payments. Just open the transaction and click More at the bottom. Then, select Delete to remove it in your account.
For more details about customizing reports, you can check out this article: Customize reports in QuickBooks Online (QBO).
I have a link here where you can find articles about managing your reports: https://quickbooks.intuit.com/learn-support/en-us/reports/07?product=QuickBooks%20Online.
Fill me in if you need a hand with applying credit memos and delayed credits or any QBO related. Have a great weekend.