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Modal wrapper in collections

Hi everyone,

I have a problem with a modal wrapper inside a collection list.
I’ve created an overview with publications and clicking on one of the images should open a modal wrapper showing details about this publication.
Everything works fine except the wrapper is showing ALL publications in the modal wrapper on top of each other with the latest on top. If I limit the items to one also the overview shows only one item.

Does somebody have any advice for me?
Would it help to have different collections with (multi) reference field or something like that?

Here is my read only link:

And this is the site:

the overview

the modal wrapper

Here is my public share link: [LINK][1]
([how to access public share link][2])

Thank you for any advice.