Hello there, Anon99. Let me share some insights regarding duplicate printed checks.

Duplicate checks in QuickBooks Online (QBO) after transitioning from QuickBooks Desktop (QBDT) may be caused by issues with CSV imports using SaasAnt or the in-house printing process. Errors can arise from problems with the software, data imports, or check number assignment if not managed carefully.

In some cases, there might be differences in how your books appear after switching from QBDT to QBO. You may also notice some transactions, such as checks and invoices, being converted into journal entries.

Refer to this article for more information on how and where the transactions are being mapped: Learn how features and data transfer from QuickBooks Desktop to QuickBooks Online.

If you still haven't located where the missing checks are being mapped, I recommend reaching out to our contact support team so they can assist you with the issue effectively.

Feel free to reply below if you have any additional questions about printing errors. We're ready to help you promptly.