New posts not showing in category archive

Hi

I have suddenly today started experiencing a problem with the category archives on my site – https://www.emilyluxto.co.uk

All the new posts I published today are not showing in my category archives. However they are showing on the homepage and I can find them by going directly to the URL of the individual post.

For example the post https://emilyluxton.co.uk/postcard-from/austin was published today at 11am UK time under my Postcard From category, but when I go to that category’s archive on my site https://emilyluxton.co.uk/postcard-from that post is not showing.

Please can someone help?!!
Thanks
Emily