Hi, A-PeeR, nice hobby ;)
Everything on your site is OK :)
You see, comments are not shown in archive view (category, monthly archives, etc.) - you have to go into page/post itself, to see the comments, eg:
Now, the problem is that by default full article is listed on archive view. I suggest to list only intro of the post, then "read more" link will be showing up and that's kind of logical for readers to click and go visit full post. To list just intro, go into editor, place cursor in the text where you would like to cut the post and click on MORE button in the editors tools section. It will insert <!--more--> tag into text. That's it ;)
Also another suggestion. If you want to have a menu item just as a container for sub-items (without linking to any actual pages):
1. Create a link menu item with any link address (you should enter something there, otherwise WP will not let to create the menu item).
2. When it is already created, edit it by deleting the link address.
This way you will be able to stack other items under it, but you will not have to create an extra page, sometimes it may be confusing for users too.
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