NextGen galleries not showing on my pages

I’m having a problem with galleries that were loaded onto my site a while ago. I haven’t checked them in a long time, so I’m not sure when it happened, but I’ve now noticed that none of the galleries I loaded onto posts are working. If I go into the galleries tab they are there, and I have not changed the short codes at all, but still they are not appearing on the posts.

Can anyone tell me why this might be happening?

https://www.ads-software.com/extend/plugins/nextgen-gallery/