If you see other item prices after the login than before the login your internet connection probably runs with a server which is located outside the EU.
That is very common if you are using a company computer our Apple products.
Because of your detected IP-address you will automatically see net prices in our shop (with the reference VAT-free below the price).
As soon as you proceed to checkout and choose a country of delivery which is located inside the EU prices will be increased by the amount of the VAT automatically.
You can check your country of delivery at our homepage top right and change it if necessary.