QB Issue Resolution:
I would suggest deleting the credit memo that you created since that amount since it seems to have been automatically applied. This should correct the balance. Additionally, there is a setting within your account that will automatically apply credits. It may be beneficial to turn this off for future use. This can be done by:
1. Click the gear icon in the top right corner.
2. Select Account and Settings.
3. Choose Advanced.
4. Click the small pencil in the Automation section.
5. Uncheck “Automatically apply credits.”
I found a link for you that breaks down credits, credit memos, and refunds: https://community.intuit.com/articles/1145640-applying-a-credit-memo-credit-or-refund-for-a-customer.
Resolution for Issue 'Credit Memo and Refund' available: Yes (Solved).
Source: Intuit Community forum.
Credit Memo and Refund: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Balance
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