There are a few possible reasons why this might have happened. It could be that the invoice and payment weren't successfully linked in QuickBooks Online (QBO), Diego. Here’s an additional information can try, along with some further actions.

If you report on a cash basis, you may see two accounts for unapplied cash payments. These accounts are automatically created by QBO for cash-basis reporting and can't be deleted or changed. Unapplied cash payment income may appear on your report if:

• A customer prepaid you and you recorded the payment before creating the sales form (invoice or sales receipt).
• You entered payments without matching them to sales forms.

I can share some steps to help you correct the unapplied payments. You’ll need to link the deposits to your open invoices in the system. This ensures your records are accurate and helps avoid errors when reconciling your accounts. Ensure the date is set in 2025 so it doesn't affect the 2024 data. Here's how:

1. Log in to a web browser.
2. Open the Invoice, click Receive payment.
3. Make sure to tick the Unapplied Payment under Credits and the invoice under Outstanding Transactions.
4. Click Save and close to reflect the changes.

Then, you can match this if the payment transaction is already downloaded on the Banking page. You can refer to the steps below.

1. Go to the Banking menu and select the bank where your customer's payment has been deposited.
2. Find the transaction with the correct details. QuickBooks will automatically detect the transactions that matched with the downloaded ones from the bank. A green mark will show on the transaction.
3. Click the transaction and verify the details.
4. Select the Match button.

Moreover, you can check these resources for additional reference about unapplied payments:

• What's Unapplied Cash Payment?
• Unapplied cash payment income on your profit and loss
• What to do if you see unapplied cash bill payment expense on your profit and loss

Allow me to share these articles in case you need more guidance and resources when working with your banking transactions: 

• Add purchase orders to expenses, bills, or checks in QuickBooks Online
• Enter and manage bills and bill payments in QuickBooks Online

With a Payments account and QuickBooks Checking, your payments and spending are automatically synced to keep your books up to date. Whether you need guidance from bookkeeping experts, want your books organized for tax time, or prefer a dedicated bookkeeper to handle everything, Live Experts has you covered.

Please let me know if you have any further questions about unapplied payments in QBO. I'll be around to help you.