I am trying to print preview an invoice to make sure it looks correct (Just like I have done every month for the last year) but my print preview recreates my whole QBO

Let's run some steps to determine what causes the issue, houlihankp.

To start with, let's open QuickBooks on a private window. It is where we can identify any browser-related issues on the opened pages. I've added these keyboard keys to open one:

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

If it works, we can go back to a regular browser and clear its cache. Once caches are piled up, it can cause any unexpected behavior on the opened pages.

We can also use a different QuickBooks-supported browsers like Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge.

Also, if you want to let your customers pay the invoices online, you can check this reference: Take and process payments in QuickBooks Online.

Let me know how these steps work on your end. Keep safe!

Greetings,@houlihankp.

Thank you for posting back in the Community and for going through the troubleshooting steps my colleague provided. 

I suggest contacting our customer support team since the same thing occurred after performing the troubleshooting steps, This way, we can further isolate and assist you with the issue on the invoice. 

For future reference, you can review: How to print an invoice. This will help you print out an invoice.

Please let me know if I can be of any additional assistance. Stay safe and have a great weekend!