Bug with cart module and PayPal Express button

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.4.8
-- PHP version -- : 5
-- Browser(s) name and version -- : Firefox 41.0.2

Hello, I have the problem with cart module when I show PayPal Express button below the cart.

Just have a look at the page I mentioned as "Url of the page with the problem" for this topic and try to add an item to the cart.
When I add the item and then click "Continue shopping" - I see only 'Total' information for the order in the right sidebar of the page (this is standard hikashop cart module). Then if I refresh the page - I see full information and the button Proceed to checkout and that is fine. Disabling showing PayPal Express button below cart module (in PayPal express plugin settings) helps and all information showing without reloading the page. The problem is that I need to shop paypal Express button below below the cart. Could you please help me to fix this?