Thanks for coming to the Community for help, @SCrawford.
I’m here to provide some insight regarding the negative quantity on your POs in QuickBooks Online.
There are two possible reasons why the quantity is off, the transactions are corrupted or because of local internet files. Let’s perform some basic troubleshooting steps to make sure the issue isn’t browser-related.
Sometimes cache stores up in the system causing problems on the web pages. To start with, log in to QuickBooks from a different browser or using a private window.
If it works, clear your browser’s cache to fix the unexpected behavior in the product. Here’s an article to help you with the process: Delete or Disable cache and temporary internet files in your web browser.
However, if you continue to get the same result, I suggest deleting and recreating the POs that are showing a negative amount. This way, the damaged transactions are replaced with the correct one.
I’m adding the following articles for reference:
That should do it. Let me know if this works out for you, I’m always here to keep helping. Have a good one!