Why is it when I send out invoices or estimates, it sends out two same copies? I don’t how know to fix so it only mails out one copy.

Hello there, nuovoinizio. Let’s go through some troubleshooting steps to prevent sending duplicate invoices in QuickBooks Online (QBO).

There are times when your browser may encounter data issues, which can cause QuickBooks to behave unexpectedly. To check if this is the problem, let's log in to your QuickBooks Online (QBO) account using a private browser. To do this, press the following shortcut key on your keyboard:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

If this works, you need to clear the browser's cache so the system can start fresh. If you get the same result while using a private browser, I suggest switching to a different one.

Moreover, I've added this article as your reference in tracking invoice payments: Record invoice payments in QuickBooks Online.

Feel free to revisit this post if you have more concerns or follow-up questions about sending invoices. I'm always here to help.