sub gallery sorting not showing

Hi
We have parent galleries with sub galleries. We used to just add the shortcode for the parent gallery, and the sub galleries would show as clickable buttons on the page, similar to ‘free gallery grid 1, free gallery grid 2’ etc on your demo here:
https://www.robogallery.co/demo/gallery/free-gallery-grid-1/

However, these are no longer showing as options, and we only see the button for ‘All’.

Can you please advise on how we can get the sub galleries to show as options again on our gallery pages?

Thanks