Double Emails

[Guest Mad Jack]

Hello, I'm running cubecart 5.0.6 my store is located here https://shop.motorcycletraining.com/

I only have digital products in the store and I'm running card capture as we run the CC's offline through our merchant terminal. When I go into the admin panel and change the order status to 'order complete', it sends out the email with the correct download links which all work fine, but for some reason it send two identical emails approx 2 minutes apart? I've clicked around trying to find any option screens to stop this but so far no joy.

Could someone please tell me how to make CC send just one email? Because customers always call and think they've been billed twice

Thanks,

Jack.