Problem with images showing in sections on homepage (blog)

Site: https://patchwork-quilting.co.uk/

Hi – I’m trying to add images in my posts (I’ve created a test post with sections) – the text works fine but the images don’t show on the homepage, unless I click on the actual heading to look at the post.
Under Settings-Reading, I’ve made sure that “For each article in a feed, show” that ‘ Full text’ is selected but on the homepage I don’t see the image.

The top post is a sticky post, the other posts were made pre-Gutenberg. The new post, with a section is called ‘Allison’s New Post’ and looks empty till you click its heading.
Any advice?

Thanks
A