Hi Leonie,

Thank you for informing us about the issue you encounter with CUA bank.

As I've checked our records, I've confirmed there's an ongoing problem with missing transactions in CUA bank in QuickBooks Online (QBO). I suggest contacting our Customer Care Team so they can add you to the list of affected users. From there, you'll be notified once this issue gets resolved.

To reach them, click the ? Help button at the top-right corner and select Contact Us to talk with a live agent. 

In the meantime, you can utilize the WebConnect feature to download them and import the entries into QBO. This article about uploading events manually outlines the complete instructions on how to perform the process.

For future reference, here's a great resource about the best practices when reconciling: Reconcile an account in QuickBooks Online.

Don't hesitate to let me know if there's anything else I can do to help. I'm always here to assist. Have a nice day.