CMS collections - if I update an image in one project, it appears on all the others

Hi, I have a template I purchased. The Zero Agency template. I’ve just started using Webflow this week so I’m still learning. I figured out most things but regarding collections. I’ have been able to update my portfolio projects except for the images. They’re set in a grid and currently if I update one image, it will update every project within that collection. How do I stop that?

I’ve tried everything I could think of.

My website is: