Let's go over a couple of troubleshooting techniques to resolve your issue regarding progress invoicing in QuickBooks Desktop (QBDT), @sjsharki01.

Before doing so, let's ensure to back up your company file so you can seamlessly restore your data when you run into problems as we go along. 

Then, let's check the Audit Trail report for any modifications made to the invoice. A user may have made changes to the transaction, that's why it displays an incorrect amount after converting from an estimate. To do so, go to the Reports menu, click Accountant & Taxes, then Audit Trail.

If there are no alterations, I suggest manually deleting and recreating the invoice to trigger the system to correct the changes. 

However, if the issue continues, it's more likely data damage. Don't worry. Follow the solutions stated in this article to repair minor company file issues: Fix data damage on your QuickBooks Desktop company file. Ensure to update the program to the latest release for an enhanced QBDT experience.

Furthermore, you can use and customize invoice templates to give them a nice appearance when sending them to your customers. 

It's always my priority to address your invoice concerns in the Community. To keep me updated, tag my name in your replies and I'll be there right away to respond. Be safe and well.