Art Dynamic Image Size Issue (Blog on Mobile)

Hi, until today our blog feed has populated with art dynamic images, preview headings etc. all at a consistent size.

I have noticed for our most recent blog post this appears smaller on mobile. I can see an extra 20px margin-left and right on .art-collection-list-content, but even when removed it doesn’t seem to make a difference.

Here is the URL: myhaventime | Blog

Does anyone have any idea what might be going on?
Many thanks,
Sophie