cart page from two different url's?

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.4

I changed hikashop hidden menu to an extra horizontal menu for customers. It appears on pages for customer information.

So, if I press the "proceed to checkout" button in "my basket" module, the url is: ............./my-basket/checkout
and if I press the "my basket" (hikashop_checkout_cart) item in menu, the url is: ............../my-basket
In both pages is the same content: my basket (hikashop_checkout_page)

Where is a mistake?