Paypal Express perform order immediately without redirect

[ocastx]

Hi,

I have problem with the PayPal Express checkout:

When on the product page, I click on checkout with PayPal Express and it shows me the PayPal Popup. Now when entering all my data and clicking on "Continue" the popup closes and my Shopify shop loads. All fine so far.
But now I get redirected to the Shopify checkout page where I have to confirm the shipping method again, and in the next step I need to select PayPal as payment option as well before clicking on "Buy". I thought that with PayPal Express the customer gets the option to place the order immediately on the product page instead of going through the shipping method and payment selection pages again. 

Is this a configuration problem or did I not get the concept of checkouts in Shopify right?

Thanks in advance!