Unlink styles in page


I am in the process of creating my website. However I have a problem.
I have created a page to showcase one of my projects, however when I duplicate it and edit the new page, the orignal also changes. I have tried to look at tutorials on classes, combo classes, on the forum but I still haven’t managed to fix the problem.

Here are some screenshots to illustrate my problem:

I created a collection page with different projects inside

When I change the picture, it is also modified for example on the project “Deserunt et nam saepe”

Here is the link to my site (the page that concerns me is named “Test” in the collection page) : Webflow - Valentin's Marvelous Site

I look forward to your help,

Valentin Riverrain

Here is my site Read-Only: LINK
(how to share your site Read-Only link)