I know this is quite disturbing, carldac. 

I'm here to share some details about why this is happening.

The recurring transactions are created and sent on the day between 12:00 am and 5:00 am. This depends on your time zone and the volume of the transactions. For more details, please see this article: Scheduled Transactions Created with a Template.

As of now, we can't modify the time when the invoices will be sent to your customers. As a workaround, I'd suggest changing the template type to Reminder. Then, send the transactions when they are due.

Additionally, I've added an article that'll help you personalise and add specific info to your sales forms: Customise Invoices, Estimates, and Sales Receipts.

Please let me know if you need help creating and managing recurring transactions. I'm always here to assist you.