Thanks for joining us here in the Community, Nb77.

I want to make sure the details of the invoice don't disappear in your QuickBooks Online account.

As an initial troubleshooting step, I recommend clearing the browser cache. The cache is used to collect frequently used data and can cause certain viewing and performance errors if it becomes too full. Clearing it will remove anything that's preventing the invoice from loading properly. Here's how to get this done in Chrome for example:

1. At the top right, click More (three vertical dots).
2. Click More tools and then Clear browsing data.
3. At the top, choose a time range. To delete everything, select All time.
4. Check the boxes next to "Cookies and other site data" and "Cached images and files."
5. Click Clear data.
 

The following article provides similar steps for other browsers: Clear cache and cookies to fix issues when using QuickBooks Online

Please give this a try and let me know how things look afterward. I'll be here to lend a hand.