[Plugin Category Shortcode] not displaying correct posts

I have this set up and it seems really simple. Create the shortcode and add it to the page. Trouble is that it doesn’t dsiplay the right posts, i.e. the ones for the category selected. I have one Category where there is just one post and it displays that one OK but none of the others seem to work, in fact I just get a list of the headers of the same page, which isn’t even in that category.

Any ideas please

Thanks