[solved] checkout is not rendering

-- HikaShop version -- : Starter 4.3.0
-- Joomla version -- : latest
-- PHP version -- : 7.3.9
-- Browser(s) name and version -- : FF, Chromium

Hi,

I'm trying to create a simple ecommerce website (please use Polish version as English version is not up to date).
What I have is a list of products I want to "sell" (it's a school assignment) with "add to cart" button which works just fine.
When I proceed to checkout it's navigating to /index.php/pl/hikashop-menu-for-categories-listing/checkout and the only thing I can see is my - made from scratch - template (you can see in source code that it didn't load any markup).
To display specific content for given web pages I have this code in index.php

...
<div id="main">
        <nav>
            <p>Menu</p>
          	<jdoc:include type="modules" name="menu" style="none"/>
        </nav>
        <main>
            <div id="cart">
              <jdoc:include type="modules" name="cart" style="none"/>
            </div>
            <jdoc:include type="modules" name="main" style="none"/>
        </main>
    </div>
...

Now it works like a charm. Thank you very much!