Amazon Pay forcing Auto completed orders

When I activate Amazon pay plugin on my site it causes all orders (including stripe,paypal) to create completed orders. My products are not virtual or downloadable and have always been in processing mode when a customer purchases.

So when a customer purchases they don’t receive a confirmation email with all the product details, instead they receive a completed order with no product details. I have unfortunately had to turn it off which is a shame because my sales started to increase using it for only 2 days.

If anyone has any insight into why activating the Amazon pay plugin would cause all orders to be autocompleted please let me know it would mean a lot. thanks.