Hello derek15,
It's possible that a credit was applied to the invoice automatically. This is why it shows paid. Before doing so, let's make sure to un-check the Automatically apply credits in the settings.
Here's how:
- Go to the Gear > Account and Settings > Advanced.
- Scroll down to Automation and un-check the Automatically apply credits option.
- Click Save and then Done.
Once done, we can check the payment linked to that invoice by following these steps:
- Go to Sales > Customers.
- Click the customer's name and open the invoice.
- Under PAID, click the 1 payment made link and select the date link.
- In the Receive Payment page, un-link the invoice and click Save and close.
Then, apply the correct payment for the invoice. The following article includes a video tutorial: How to Record Invoice Payments.
You can always get back to me if you have any follow up questions. Thanks.