Welcome back to the thread, Brian246. I appreciate you clarifying your concern about managing checks in QuickBooks Desktop. Let me direct you to the appropriate support team for additional assistance with this situation.

Since updating QuickBooks didn't fix the entire issue and seems that it does not connect with damaged data, I suggest contacting our QBDT Support Team. They have the tools to pull up your account and be able to deeply investigate the cause of the unusual behavior when writing checks in the program.

Here's how:

1. Press F1 to open the Help window.
2. From the search icon, type Contact Support.
3. Click Contact us at the bottom part.
4. Give a brief description of your issue about managing checks and click the Search button.
5. You'll be routed with How to connect with a QuickBooks expert and you choose which one is best for you.

Lastly, refer to this article if you need steps in deleting or voiding checks in QBDT: Create, modify, and print checks.

Please post here again if you have other questions or concerns with your checks in QuickBooks. I'll be right here to help you out any time, Brian246. Keep safe!