Half collection items appear in collection list

Hello all,

I face issues with collection list and collection items for my blog. I have 6 articles and strangely, it shows only 2 articles per row instead of 3. As you can see in the screenshots below.

Also, when I sort my items, it doesn’t work as you can see the date.

Do you have any idea why I face this issue ? Thanks for your help

You can find the read-only link below

Here is my public share link: Read-only link