CMS Collection: dynamic URL field isn't working (

Hello everyone

I have a problem with the dynamic URL field, connected to my collections. Even though I added a different URL to every element of the collection, pushing the ‘download’ button will result always to the same URL.

Does anyone have an idea why this happens and how to solve it? I will be so thankful!
Here is my link:
https://preview.webflow.com/preview/fragmenten?utm_medium=preview_link&utm_source=designer&utm_content=fragmenten&preview=b0392a37a138e2b4f0df24b24f335c47&pageId=601d7a5b572dab73e640b142&mode=preview

Kind regards

Tobias