Thanks for getting back to us, @EBFinancials.

Also, I appreciate the details you've shared. Let's repair your QuickBooks Dekstop (QBDT) and fix any errors and issues in your company file. Let me show you how.

Before doing so, ensure to back up your company file. Once done:

1. Restart your computer
2. Open the Windows Start menu, then select Control Panel.
3. Select Programs and Features then Uninstall a Program.
4. Choose QuickBooks from the list of Programs, then Uninstall/Change.
5. Click Continue, or Next.
6. Select Repair, then Next.
7. Once it's done, select Finish.

Here's an article you can read for more details: Repair your QuickBooks Desktop for Windows.

Nonetheless, here's how to remove/delete terms entry in your QBDT:

1. Go to the Lists menu.
2. Select Customer & Vendor Profile Lists.
3. Click Terms List. 
4. In the Terms List window, select the term you want to remove.
5. Click the Terms drop down-arrow and Delete Terms. 

You can also check this article for more details about payment terms: Set up payment terms.

In case you need to refund a credit card payments, you can refer to this for the details: Void or refund credit card payments in QuickBooks Desktop.

You're always welcome to post here anytime. I'm more than happy to help. Stay safe and healthy! EBFinancials