CMS collection item is being duplicated across different URLs

Collection items are being duplicated across different URLs. Please see the following example:

Correct URL

Duplicate Content

1840 pages are affected with the following error reported by search console: “Duplicate without user-selected canonical”

The sitemap is not showing any of the duplicate URLs.

Has anyone encountered this problem before?

Thank you in advance for your time and consideration.

Here is my public share link:

Hi Matteo, you don’t actually have a canonical URL set on your pages.
Here are some notes on how to set it properly;

Thank you for reviewing and taking the time to reply. I believe I have now correctly set up my canonical ULS. I will monitor search console and hope to see some improvements soon. Have a nice week.