Image scaling in instance

I’m creating a pretty classic news component, with image at the top, copy at the bottom. In this component I want to be able to change the image size so I’ve created an image component with different image sizes (on the left in the video here: Imgur: The magic of the Internet).
As you can see in the video, when I updated the image in my main News component (in the middle) it works perfectly fine but when it’s an instance nothing will change (0:08 in the video).
I’ve been looking for a while on how to fix that but I couldn’t fine anything helpful. If anyone has an idea or an article about this it would be really helpful.