Has anyone else had a glitch on invoice "Save and Send" whereby Quickbooks creates and sends two copies of the same invoice but with different invoice numbers?

Hi cbd1, 

Thanks for reaching us here on the Community. 👋

This sounds unusual and it's not an issue that we currently have reported, to troubleshoot, please clear the cache on the browser you're using for a time period of 'all time' and then close/re-open this before signing back in and sending a test invoice to your own email. 

Please get back to us below if the issue persists!