The content of an additional section changes for all blog collection pages

I have three collection pages, each shows a different category of blog posts. I wanted to a simple text section at the top of the page to describe the page, however, it seems that all three of these pages share this extra section.

Let's say I have collection pages A, B and C. I add a text section above the blog posts and write some text about posts on page A. I then go to collection page B and see that there is already a text section and has the text from A. If I change it to speak about B, save it and then go back to A, I now see text about B. And so on.

Is this a feature or a mistake? I would like to have a different description for each of the collection pages.

EDIT: I just noticed that it is shared even on the main blog page. It seems to be a feature then and I need to find a work-around!

Can you share link to 3 collection pages? We can take a look

Also do you use Personal or Business Plan?