When I click on any item in the shop the page of item is shown for 2 seconds and then main shop page is loaded.
The same thing happens to me, but I found that I can get around it by hitting the stop button in my browser as soon as the product page loads. Its not ideal, but it gets the job done.
Why would you need those pages? They are just stubs, as we couldn’t disable them as they are part of the shop, but all the information about Navio and Navio Raw boards as well as accessories are on the single following page - http://www.emlid.com/shop/navio/. The items can also be added to the cart from there.