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Are you using QBO? Try to refresh the page. Are you log in from app or browser? If app, log out and log in on brower? Brower is more stable than app.
Hope it helps
All the best
Anthony Accounting Support Center
The template used on your invoice can be the reason why the data doesn't show up when previewing it. Let me show you how you can change your template.
To start with, @Anthony Accounting Center is correct. Most customers who encounter issues while working in QuickBooks can be fixed by performing some browser troubleshooting steps.
You can do so by following the steps outlined in this article:
Meanwhile, let's go ahead and change the template of your invoice:
In addition, here's an article you can read to learn more about customizing your invoice template: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Lastly, I've got you this helpful article in case you need to upload or change the logo of your sales transaction: Add, customize, or remove logos on sales forms.
If there's anything else that I can help you with, let me know in the comments. I'll be here to lend a hand.