I am sure there is a lag sometimes and this might happen with others, but we use CE. I have noticed a random issues in the past week, well two really.
The first, most times when new orders come in, I get:
- order email
- billing email (saying its due)
- billing email paid/rejected (depending on the payment method.
For some reason my order of emails is flip flopped, today I got something saying a client (new client) was due, then I got the order, then I got the paid conf.