QB Issue Resolution:

check company settings, automation, it sounds like you have the setting to automatically apply credits set to on.  With that set to on if there is a credit, it will pay the invoice

Resolution for Issue 'When I create an invoice it is automatically shown as paid and I don’t know how to change it. How can I change it that the status is unpaid?' available: Yes (Solved).
Source: Intuit Community forum.

When I create an invoice it is automatically shown as paid and I don’t know how to change it. How can I change it that the status is unpaid?: 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.

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