On my News Wall, Only One Article DIsplaying

On my older news wall categories, when the category is selected all of the articles display. (See USA)

Now, when I create a new article and add it to an existing category, when that lone category is selected, only one article will display (rest can be accessed through READ MORE button.) (See UK)
irishdancing.global/index.php/find-irish-dance-schools

Any suggestions would be greatly appreciated.

Thank you for the reply @HAiND - unfortunately I do not see how to insert an image into this stream. (And the help link above is broken)

Can you give me an email or how to paste the images here?

Again the issue is that somehow when I select one news topic, (such as UK) only one of the listings is appearing on the default screen. If I push the read more - the rest appear.
irishdancing.global/index.php/find-irish-dance-schools

This is only happening under the last created categories (such as Canada). Under the older categories, when selected, I see the full 4-6 entries/articles.