When switching between pages, it happens that the wrong shipping is calculated, for example I have 5 products on the store and shipping is free → I go to the next step of the cart → I go back with the back arrow and change the number of products so that the shipping comes out at full price.
However, when I move the forward arrow to the next step again, I am left with the free shipping price.
This is fixed by adding javascript functions "UPDATE_TRANSPORTATION" and "UPDATE_PAYMENT" (available for example on cycloanimal.cz) to mutations.js