Why is quickbooks online deleting checks that I voided?

Thanks for posting here and letting us know you've encountered the issue when voided checks are being deleted, Dave. Let me share some information to have this investigated further.

Please note that we've received similar cases or reports about this issue. I suggest contacting our support so they can add you to the affected user list. You can present this investigation number (INV-101304) to our representative to speed up the process. Let me show you how:

1. Log in to your QBO account.
2. Click the ? Help button at the top right corner.
3. Go to the Search tab, then select Contact Us.
4. Enter a brief discussion with your concern, then click Continue.
5. Choose a way to connect with us.

You may check out our support hours to ensure we can address your concerns promptly.

Drop a reply anytime if you still have concerns regarding bills. I'm here to lend a hand. Keep safe.