How do I fix some quantities on an invoice not printing?

Thanks for bringing this up, @fd14. 

 Let me provide you with some insights about your concern. Upon checking here on my end, if these line items are billable, we have an ongoing investigation that the quantity will not show when printing. Please contact our Phone support team so they can add you to our notification list, and you'll be notified via email once the update is available.

However, if these items are regular items, you can perform some basic troubleshooting steps to get this sorted out. This may also be an old cache and cookies creating the issue. To verify, we can log in to your QBO account using a private browser. To do so, press this shortcut key on your keyboard:

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

If it works on the private browser, you can return to the regular browser and clear your browser's cache. Then, see if it works, and you can go through without the error. Otherwise, you can use another supported browser.

Furthermore, if you want to record invoice payments in QuickBooks Online, this article may come in handy: Record invoice payments in QuickBooks Online.

Please get back to this post if you have other concerns about printing invoices in QuickBooks Online. I'll be around to provide further assistance.