How do I stop items/pages from duplicating each other in a collection?

I am very new to Webflow and was wondering how I can edit and change the content of different items/pages without them becoming duplicates. It appears that when I make a new edit on an item all of the other items end up copying those new edits, is there a way to stop this from happening? Thank you.
https://preview.webflow.com/preview/stephens-sublime-site-56514b?utm_medium=preview_link&utm_source=designer&utm_content=stephens-sublime-site-56514b&preview=430cfed5cf0a0e479ec1f93f391a7cfb&pageId=63e0bf4210d0b964b26668d4&itemId=63e0bf4210d0b90bef6668fc&workflow=preview


A collection template is used by each collection item. You bind collection fields to elements in the template to render unique values. Check out the university for documentation.