My invoices keep marking as paid before I can send it ?

Welcome to the Community, @rmolan-outlook-c.

It's possible that the Automatically apply credits option is turned on in the settings. This lets the system use adjustment notes as payments for newly created or open invoices.

If you don't want to use this feature, here's how to turn it off:

1. In QuickBooks Online (QBO), go to the Gear icon at the top right to get to the Accounts and Settings. 
2. Select the Advanced menu at the left pane.
3. Click the Edit (pencil) icon in the Automation section, then remove the checkmark in the Automatically apply credits box.
4. Hit Save.

To give you a better view of this process, consider checking out this article: Create and apply adjustment notes or delayed credits in QuickBooks Online.

On the other hand, if the feature is already turned off, signing into your QBO using a private browser (incognito). This will help us check if the browser is full of frequently accessed page resources (cache and cookies), causing this odd behavior.

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

Once logged in, try to create a test invoice to double-check.

If the transaction remains unpaid, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.

Please let me know if you have any other issues or concerns, and I'll get back to you as quickly as possible. I'm always here to help. Have a great day!