Several of my (saved and unsent) invoices are showing as sent and paid? They are neither; what has happened and what do I do to fix this and avoid it happening again?

It's my pleasure to provide some information on why some unpaid invoices showing as paid and sent, @info-jkabelfast-.

It's possible that the Automatically apply credits feature is enabled. Once it's turned on, the system will apply a payment to the open invoice. To avoid this from happening in the future, we can turn this off in the Account and Settings menu.

Let me show you how:

1. Proceed to the Gear icon, and then select Account and Settings.
2. Choose the Advanced tab.
3. Click the pencil (edit) icon in the Automation section.
4. Toggle the Automatically apply credits box to disable this option.
5. Lastly, click Save, and then Done.
   
   

Then, follow the steps below to remove the payment from an invoice in QuickBooks Online (QBO):

1. Select Sales and click Invoices.
2. Choose the Invoice transaction you want to mark as unpaid.
3. Click the 1 payment link under the PAID status. 
4. Select the date of the payment.
5. Choose More at the bottom of the payment.
6. Select Delete, then click Yes to confirm that you want to delete it.

Additionally, you can also review these articles to learn more about receiving payments and applying a credits in QuickBooks:

• Record invoice payments in QuickBooks Online
• Handle a customer credit or overpayment in QuickBooks Online

That should do it! Let me know if you have a follow-up question about your invoice status. I'm always here to assist you. Have a great day!