I appreciate the screenshot you've provided, @rcasey362.

Let me provide some information about the Pre-fill forms option in QuickBooks and help you from there.

This option will only pre-fill information, like the vendor's name, products or items, and description you've previously entered. Thus, the Purchase Order's (PO's) number will remain in sequence.

In the meantime, you can consider editing the PO manually to correct the transaction number. And if you receive A purchase order with number ## already exists error when editing the PO, you'll just have to click the Yes button to confirm the changes.

However, if you were not able to receive that error and can't edit the PO, I recommend performing some troubleshooting steps to get this fixed.

There are times that the browser is full of frequently-accessed page resources, thus causing websites, like QuickBooks Online (QBO), to act weirdly. Let's try logging into your QBO account using a private browser.  

To use a private browser, here's how:   

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

Once logged in, go back and try yo edit the PO again to double-check.

If this works, it means that you need to clear your browser's cache so the system can start fresh.   

If you get the same result while using a private browser, I recommend switching to a different browser. 

In case you want to run purchase order reports, you can check out this article for more details: How to Run Purchase Order Reports.

Should you need any additional assistance while managing your purchase order transactions, you can leave a comment below. I'll be sure to get back to you.