Very occasionally the website order notification will show up without an order showing up in the Admin - no need to worry! Your Admin always shows you ALL of the orders placed on your website or point of sale (if you have a POS).
Floranext uses a third party provider for their order notifications - occasionally these messages are delayed by hours. While these are typically very quick (seconds after an order is placed) we don't have full control over the sending.
Please check your Admin - if there is no new order you can ignore the notification.