Hi,
What you’re experiencing is normal with the current email setup in HikaShop: the system sends separate emails for each step (order created, PayPal payment confirmation, status change, etc.), which can result in multiple messages for one order, especially with payment gateways that trigger both a payment notification and a status change.
To reduce the number of emails:
Adjust which emails are published in System > Emails so only the ones you really need are active.
Consider disabling the "order status notification" email if the customer gets a PayPal confirmation and you don't want too many emails.
You can also disable the "order creation notification" email since the user already receives an email after the payment.
In HikaShop 6.1+, you can also restrict emails based on payment methods directly when editing email settings. This can be useful if you still want the "order creation notification" email to be sent for offline payment methods like bank transfer as they won't be getting an email from a payment gateway in that case.