The template YOO Solar on the home page display all items in the K2.They should be displayed in 3 columns, but after the last update of K2 appears only as one column wide to 1/3 of the width of the page.

This page akfklaps.pl/

Please tell me how to fix it.

I found something strange ...
Each category is set to 15 entries in three columns, but the menu when I link to Category Browse set the record 2/1 4/2 4/1 4/1 and I can not change that so long as the link is pointing to a single category.

When the link is pointing to all categories in K2 regardless of the settings is always one column.

Screenshots below.

Screeny poniżej.
imgur.com/9ysQoYx
imgur.com/Vrymr8j

I agree, but regardless of how this setting, and so are always shown in one column. Settings shown on the pictures is the link:
akfklaps.pl/nasze-filmy/fotosy-z-planu-tak-powstaja-nasze-filmy
and though the setting category 3/15 says it shows only one column.
The home page provides articles from all categories and równeiż should be 3 columns - so says the setting of menu items.

Najazabawniejsze is that until recently it worked, and the updates stopped.
If there is anyone who can help me, willing to give him access to the admin.

You have disabled the loading of K2's css.
You need to re-enable this option. It is located in K2's settings.