Hello there, reaengineering.

Since you already updated the contact information, we can run the Verify/Rebuild Data to help resolve this.

1. Go to the File menu.
2. Select Utilities and Verify data.
3. If you can see QuickBooks detected no problem with your data, click OK.
   Try to double check and create another invoice.
4. If Verify finds an issue, we need to Rebuild Data.
   Follow the prompt to save a backup file.
5. Hit OK when you see Rebuild has completed.
6. Run Verify Data again to check for remaining data damage.

You can check out this helpful article for your reference: Resolve data damage.

Keep me updated how it goes. You can always drop by if you have other questions.