I want to get this problem resolved as soon as possible, mpumi. I'll walk you through some troubleshooting steps to help you determine the QuickBooks Online missing invoice issues.
The following could be the case why you didn't see the invoices in the lists:
If not an admin, ensure you have permission to review invoices.
Check that the invoice status is not Deleted in the Audit Log.
Ensure that the Status, Date, and Customer are filtered correctly.
The Row is set to 300, so the transaction will show.
Once confirmed and the issue persists, I'd recommend logging in through incognito mode. This allows us to determine whether the problem is browser-related. Too much cache build-up in your regular browser can sometimes cause unexpected behaviour in the product.
Refer to the keyboard shortcuts below:
Ctrl + Shift + N (Google Chrome)
Ctrl + Shift + P (Firefox)
Control + Option + P (Safari)
Ctrl + Shift + P (Microsoft Edge)
Once logged in, re-check the invoices in the list to see if it's already working correctly. If it successfully downloads, return to your regular browser and clear the cache by pressing CTRL+ Shift+ Delete on the keyboard.